Showa Genuine Parts SPG Seat Stopper for Suspension Systems

The Showa Genuine Parts SPG Seat Stopper is developed for demanding suspension work, providing reliable support and smooth operation over rough terrain. It is designed to facilitate clean installation while protecting critical sealing surfaces during assembly. This component contributes to consistent suspension performance by maintaining proper alignment and reducing wear.

Key Features

Designed for clean and precise installation
Supports smooth suspension action over rough terrain
Protects sealing surfaces during assembly
Enables fine-tuning of suspension settings for varying terrain and load conditions

Installation Notes

During installation, ensure all sealing surfaces are clean and protected. Torque fasteners to the manufacturer’s specifications and verify proper alignment. Test ride the motorcycle and adjust settings as needed to suit specific terrain and load requirements. Installation details may vary by model and build year; confirm compatibility before ordering.

SKU	R39500003
Barcode #	8435622723945
Brand	Showa Genuine Parts
Shipping Weight	0.0200kg
Shipping Size	0.060 x 0.010 x 0.060m
Type	Rear Shock Spare Parts

See our Shipping Information See our Frequently Asked Questions

If your Motorcycle is listed below, this product will suit:

More From This Category

Showa Genuine Parts Back up ring

61 In Stock

Showa Genuine Parts Back up ring

Showa Genuine Motorcycle Suspension Parts(SKU: R35201601)

$24.00

Showa Genuine Parts Spring seat B

1 In Stock

Showa Genuine Parts Spring seat B

Showa Genuine Motorcycle Suspension Parts(SKU: R39300001)

$60.01

49mm SHOWA SKF Mud Scraper

1 In Stock

49mm SHOWA SKF Mud Scraper

Removable Scraper(SKU: KIT-MS49S)

$55.00

Showa Genuine Parts O Ring 43.7 x 50.7 x 3.5

21 In Stock

Showa Genuine Parts O Ring 43.7 x 50.7 x 3.5

Showa Genuine Motorcycle Suspension Parts(SKU: R34005002)

$4.80

Xtrig Triple Clamp Rocs Pro CRF250 22-24/CRF450 21-24

1 In Stock

Xtrig Triple Clamp Rocs Pro CRF250 22-24/CRF450 21

Adjustable offset(SKU: 40101017)

$925.00

Eibach EMS Moto Rear Shock Spring Kit 63.9/66.4 x 249 Showa 50. Honda CRF 250 450 RMZ450 (64_66-240 and 20-133)

999 In Stock

Eibach EMS Moto Rear Shock Spring Kit 63.9/66.4 x

Made in the USA (QS9000) or Germany (ISO16949)(SKU: 899)

From $249.94

Showa A Kit Suspension for Honda CRF 250/450 2025-2026

1 In Stock

Showa A Kit Suspension for Honda CRF 250/450 2025-

Showa Genuine Motorcycle Suspension Parts(SKU: AKITHON25)

$13,200.00

Xtrig Triple Clamps Rocs Tech CRF250 22-24/CRF450 21-24

1 In Stock

Xtrig Triple Clamps Rocs Tech CRF250 22-24/CRF450

Standard offset of the manufacturer.(SKU: 40101016)

$845.00

Techtool Fork Tube Tool & Cartridge Rod Holding Plate

13 In Stock

Techtool Fork Tube Tool & Cartridge Rod Holding Pl

For KYB, Showa & WP Twin or Open Chamber Forks(SKU: 93-032-00)

$220.00

Showa Genuine Parts Dust Seal 49x60.6x10.5 (with spring)

13 In Stock

Showa Genuine Parts Dust Seal 49x60.6x10.5 (with s

Showa Genuine Motorcycle Suspension Parts(SKU: F33004903)

$62.40

Showa Genuine Parts Piston Ring 50/13mm

26 In Stock

Showa Genuine Parts Piston Ring 50/13mm

Showa Genuine Motorcycle Suspension Parts(SKU: R25005001)

$62.40

Krooztune Honda CRF 250R 450R Nitrogen 48.4mm Bladder Alloy Cap

999 In Stock

Krooztune Honda CRF 250R 450R Nitrogen 48.4mm Blad

Proudly made in Australia(SKU: KT-CRFGASCAP)

From $84.95

Xtrig Holeshot HiLo 55mm Showa 49mm Fork SSF Air USD

2 In Stock

Xtrig Holeshot HiLo 55mm Showa 49mm Fork SSF Air U

Holeshot with two locking positions(SKU: 70100013)

$190.00

DRC SHOCK SEAL HEAD INSERT KIT | KYB/SHOWA | INNER 12mm / OUTER 14/16/18mm

3 In Stock

DRC SHOCK SEAL HEAD INSERT KIT | KYB/SHOWA | INNER

Shock seal Bullet set -14x12 16x12 18x12(SKU: D59-37-135)

$49.50

Showa Genuine Parts Guide Bush 49x52x15 COPPER

30 In Stock

Showa Genuine Parts Guide Bush 49x52x15 COPPER

Showa Genuine Motorcycle Suspension Parts(SKU: F27504901)

$28.80

Showa Genuine Parts Spring B L100mm K=22.6N/mm

1 In Stock

Showa Genuine Parts Spring B L100mm K=22.6N/mm

Showa Genuine Motorcycle Suspension Parts(SKU: F38100018)

$40.80

Showa Genuine Parts Push rod 4.3/215mm

6 In Stock

Showa Genuine Parts Push rod 4.3/215mm

Showa Genuine Motorcycle Suspension Parts(SKU: R29900004)

$28.80

Krooztune Honda CRF 250/450 Showa Billet Spring Seat

999 In Stock

Krooztune Honda CRF 250/450 Showa Billet Spring Se

Proudly made in Australia(SKU: KT-CRFSPGSEAT)

From $159.95

Showa Genuine Parts Oil Seal Stopper Ring

9 In Stock

Showa Genuine Parts Oil Seal Stopper Ring

Showa Genuine Motorcycle Suspension Parts(SKU: F36500003)

$3.60

Showa Genuine Parts Hand clicker adjuster Compression. by GPE (pair)

5 In Stock

Showa Genuine Parts Hand clicker adjuster Compress

Showa Genuine Motorcycle Suspension Parts(SKU: GPECLI001)

$117.60

© 2026 Teknik Motorsport Pty Ltd. ABN: 29137380324. All rights reserved.

Welcome to our website. If you continue to browse and use this website, you are agreeing to comply with and be bound by the following terms and conditions of use, which together with our privacy policy govern Teknik Motorsport Pty Ltd’s relationship with you in relation to this website. If you disagree with any part of these terms and conditions, please do not use our website.

The term ‘Teknik Motorsport Pty Ltd’ or ‘us’ or ‘we’ refers to the owner of the website whose registered office is 4/5 Harford St, JAMISONTOWN, NSW, 2750, AUSTRALIA. Our ABN is 29137380324. The term ‘you’ refers to the user or viewer of our website.

The use of this website is subject to the following terms of use:

The content of the pages of this website is for your general information and use only. It is subject to change without notice.
Neither we nor any third parties provide any warranty or guarantee as to the accuracy, timeliness, performance, completeness or suitability of the information and materials found or offered on this website for any particular purpose. You acknowledge that such information and materials may contain inaccuracies or errors and we expressly exclude liability for any such inaccuracies or errors to the fullest extent permitted by law.
Your use of any information or materials on this website is entirely at your own risk, for which we shall not be liable. It shall be your own responsibility to ensure that any products, services or information available through this website meet your specific requirements.
This website contains material which is owned by or licensed to us. This material includes, but is not limited to, the design, layout, look, appearance and graphics. Reproduction is prohibited other than in accordance with the copyright notice, which forms part of these terms and conditions.
All trademarks reproduced in this website, which are not the property of, or licensed to the operator, are acknowledged on the website.
Unauthorised use of this website may give rise to a claim for damages and/or be a criminal offence.
From time to time, this website may also include links to other websites. These links are provided for your convenience to provide further information. They do not signify that we endorse the website(s). We have no responsibility for the content of the linked website(s).
Your use of this website and any dispute arising out of such use of the website is subject to the laws of Australia.

This privacy policy sets out how we use and protect any information that you give us when you use this website.

We are committed to ensuring that your privacy is protected. Should we ask you to provide certain information by which you can be identified when using this website, then you can be assured that it will only be used in accordance with this privacy statement.

1. WHAT WE COLLECT

We may collect the following information:

name and job title
contact information including email address
demographic information such as postcode, preferences and interests
other information relevant to customer surveys and/or offers

2. WHAT WE DO WITH THE INFORMATION WE GATHER

We require this information to understand your needs and provide you with a better service, and in particular for the following reasons:

Internal record keeping.
We may use the information to improve our products and services.
We may periodically send promotional emails about new products, special offers or other information which we think you may find interesting using the email address which you have provided.

3. SECURITY

We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure, we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect online.

We take all reasonable steps to keep secure any information which we hold about you.
Personal information may be stored both electronically on our computer system, and in hard-copy form.
Firewalls, 2048 Bit v3 SSL encryption, passwords, anti-virus software and email filters act to protect all our electronic information.
We do not store credit card information, we securely submit credit card information to our bank for processing.
We will not sell, distribute, lease or disclose your personal information to third parties (unless we are required by law to do so).
We may use your personal information to occasionally send you promotional information about our products and services which we think you may find interesting.
Should you wish to have your personal information removed or updated, or you would like to stop receiving advertising please CONTACT US.

4. HOW WE USE COOKIES

A cookie is a small file which asks permission to be placed on your computer's hard drive. Once you agree, the file is added and the cookie helps analyse web traffic or lets you know when you visit a particular site. Cookies allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.

We use traffic log cookies to identify which pages are being used. This helps us analyse data about webpage traffic and improve our website in order to tailor it to customer needs. We only use this information for statistical analysis purposes and then the data is removed from the system.
Overall, cookies help us provide you with a better website by enabling us to monitor which pages you find useful and which you do not. A cookie in no way gives us access to your computer or any information about you, other than the data you choose to share with us.
You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer. This may prevent you from taking full advantage of the website.

LINKS TO OTHER WEBSITES Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.

5. CONTROLLING YOUR PERSONAL INFORMATION

You may choose to restrict the collection or use of your personal information in the following ways:

whenever you are asked to fill in a form on the website, look for the box that you can click to indicate that you do not want the information to be used by anybody for direct marketing purposes
if you have previously agreed to us using your personal information for direct marketing purposes, you may change your mind at any time by CONTACTING US.