Skoda VW Strut Bump Stop 6U0512131C | OEM Replacement Supplier & Custom Manufacturer

The rear axle of the Skoda Favorit and Felicia, together with the VW Caddy Typ 9U light commercial built on the same platform, relies on a tall and slim polyurethane column inside each rear shock absorber to control the last part of suspension travel. The 6U0512131C strut bump stop, produced by Bonpora under reference 4110012, is a direct replacement for this component. This guide summarises the specifications, applications, aftermarket cross references and customization options so that purchasing teams, importers and workshop buyers can confirm the part before placing an order.

What Does the 6U0512131C Strut Bump Stop Do?

A strut bump stop, also called a shock absorber stop buffer or suspension bumper, is the progressive cushion that sits on the piston rod of the damper, usually inside the protective bellows. When the rear axle compresses fully, for example on a pothole or during a heavily loaded journey, the metal internals of the damper must never collide. The bump stop compresses first and converts the impact energy into a controlled, progressive resistance. It protects the damper seal and rod, reduces sharp noise from the rear axle and keeps the ride predictable when the vehicle is loaded.

On these platforms the buffer is fitted on the rear axle, one on each side, so a complete service requires two pieces per vehicle. Because the part works inside the dust sleeve, most suppliers recommend replacing the buffer and the bellows together. The febi 13017 dust cover kit, for example, contains two buffers and two bellows for exactly this reason, and many distributors stock the pair as one line item.

Key Specifications of Bonpora Nos 4110012

Dimension Notes

Bonpora drawings list the buffer at 153 mm height with a 55.7 mm outer diameter and a 9 mm bore that slides over the damper rod. Several European catalogue entries record 155 mm for the same OE reference, and unit weights between 110 g and 131 g. These differences come from measurement points and material tolerance rather than from different parts. Buyers who need an exact drawing for their own catalogue can request one from Bonpora together with the quotation.

Vehicle Applications for OE 6U0512131C

The application list below combines the official Skoda catalogue data with the fitment tables published by independent brands such as febi, JP Group and Original Imperium.

The specialist Skoda catalogue notes that this stop buffer serves the rear shock absorber of estate bodies, the Favorit up to November 1993 and the Pick-up and Van Plus variants, which explains why some catalogue entries show slightly different model ranges. The Original Imperium listing for the same OE number spans Skoda vehicles built between 1989 and 2002. The VW Caddy Typ 9U was the rebadged Felicia Utility produced at the Kvasiny plant in the Czech Republic. Because production dates vary by market, buyers should confirm the application against the chassis number or the number printed on the old part.

6U0512131A and 6U0512131C

Both suffixes appear in trade catalogues and both point to the same rear buffer application. The C suffix is the reference that most independent brands quote today, while the A suffix survives in older listings and on some original packaging. Reputable suppliers list the two numbers side by side. If a customer quotation or a customs document requires one specific suffix, Bonpora can print the requested reference on the packaging under the OEM service.

Why the Height Matters When Selecting a Rear Bump Stop

The VAG range of the 1990s used many rear buffers with similar outer diameters but clearly different heights, and they are not interchangeable. A buffer that is too short engages the damper body too late and lets the internals bottom out, while one that is too tall permanently preloads the suspension and stiffens the rear axle. The 6U0512131C part belongs to the tall 153 to 155 mm class used on the Favorit and Felicia rear axle. Shorter numbers in the wider range, such as the 113.5 mm buffer of the Polo and Fabia platforms or the roughly 100 mm buffers of the Golf generation, carry different OE references. Checking bore, outer diameter and height together is the fastest way to avoid a mis-shipment.

Polyurethane Compared with Conventional Rubber

For the climates where the Favorit, Felicia and Caddy 9U still work today, from Central Europe to Russia and Central Asia, the cold behaviour of polyurethane is the decisive property. The material keeps its designed stiffness after frost nights and delivers the same progressive response season after season, which is why Bonpora moulds this reference in polyurethane as standard. Further background is available in the dedicated polyurethane bump stop section.

Aftermarket Cross-Reference Numbers

The 6U0512131C reference is covered by a wide range of independent brands, which confirms that this application remains a steady seller across Europe. The table below lists the most frequently quoted equivalents.

Cross references are provided for comparison only. Final equivalence should be confirmed on the physical part or through the vehicle identification number.

Manufacturing and Custom Service from Bonpora

Bonpora produces suspension buffers in China with in-house polyurethane moulding. Standard references such as the 4110012 run in recurring batches, while the custom service covers modified dimensions, hardness grades, colours and private label packaging for distributors who serve their own markets. Neutral export packaging protects the brand of the importer, and the standard delivery time of 15 to 30 days covers both stock orders and scheduled production. Buyers who need a dedicated article number, a specific durometer or a small pilot batch before a container order can start with the custom parts service.

How Importers Search and Verify This Part

Procurement teams usually start from one of four search patterns: the part type combined with the OE number, for example strut bump stop 6U0512131C; the vehicle combined with the part, for example Skoda Felicia rear bump stop; the part type combined with a supplier keyword, for example bump stop manufacturer or polyurethane buffer factory; and the OE number alone, which works well once a buyer has a physical sample in hand. Bonpora supports all four routes. The auto parts catalogue lists current references, the sales team answers enquiries with drawings and material data sheets, and samples can be dispatched before a bulk order is confirmed.

Frequently Asked Questions

Which vehicles does the 6U0512131C bump stop fit?

The reference fits the rear axle of the Skoda Favorit and Favorit Forman, the Skoda Felicia I and II in hatchback, estate, pickup and Fun versions, and the VW Caddy Typ 9U light commercial built on the Felicia platform. Engines range from the 1.3 petrol units to the 1.6 MPI AEE and the 1.9 D AEF diesel. Confirmation against the chassis number is recommended because production years differ by market.

Can the buffer be installed without replacing the dust bellows?

Technically the buffer can be fitted on its own, but professional suppliers recommend replacing the bellows at the same time. The sleeve keeps dirt and water away from the buffer and the damper rod, and a worn sleeve shortens the life of the new buffer. Complete kits that combine both parts are available from several brands, which simplifies stock planning for distributors.

What is the difference between 6U0512131A and 6U0512131C?

Both numbers describe the same rear shock absorber buffer for the Favorit, Felicia and Caddy 9U applications. The C suffix is the reference quoted by most current independent catalogues, while the A suffix appears in older listings. When in doubt, compare the height, bore and outer diameter of the old part or send the vehicle data to the supplier for verification.

What are the warranty and delivery conditions?

Bonpora supplies this reference with a one year warranty, neutral export packaging and a delivery time of 15 to 30 days depending on order volume and production schedule. OEM and custom design support is available for distributors who need their own branding, and quotations include material data and dimension drawings on request.

Request a Quotation

Importers, wholesalers and workshop suppliers who need the 6U0512131C strut bump stop or a customized version can contact Bonpora with the target quantity and destination market. The team replies with a quotation, material specification and packing plan, and can arrange samples for verification before production starts.