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The rear spring bumper with OE number 327 512 131 A is the compression stop fitted on the rear axle of the Volkswagen Santana and Quantum built on the B2 platform. Bonpora supplies this part as No 4110060 in moulded polyurethane, produced in China with a one year warranty and neutral export packaging. The reference covers the sedan and wagon bodies assembled for South American, Chinese and other export markets, and it matches the shape known from the European B2 rear axle parts.
Distributors usually reach this family through three doors: the OEM number, the vehicle application or the physical size of the old part. The sections below cover the fitment range, the relationship between the 327 and 321 numbering series, the neighbouring group numbers and the buying paths that wholesale purchasers actually use.
The bumper sits over the piston rod of the rear shock absorber, inside the dust boot, and works as a progressive auxiliary spring. When the rear suspension compresses fully, the bumper takes the remaining load, slows the strike between axle and body and protects the damper from internal damage. Catalogues for the European B2 rear axle list the same group as a rubber buffer for suspension, always marked for the rear position.
The part is listed for the left and right side alike, so one vehicle uses two pieces. The bumper behaves as a wear item: after years of compression it takes a permanent set, loses height and hardens. Workshops normally replace both sides together and inspect the dust boots at the same visit, because a torn boot lets grit reach the rod seal and shortens damper life.
The parameter set below is taken from the current production drawing. Confirm the bore, outer diameter and free height against the removed part before ordering in bulk.
| Item | Specification |
|---|---|
| Product Name | Strut Bump Stop |
| OE Reference | 327 512 131 A |
| Bonpora No | 4110060 |
| Size | Φ18.3 x Φ51.6 x 64.45 |
| Material | Polyurethane |
| Fitment | VW Santana Quantum |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM and Custom Design Support |
The B2 platform spread far beyond its German origin. Volkswagen built the Passat B2 and the Santana 32B in Europe between 1979 and 1988, launched the Santana in Brazil in 1984 and the Quantum wagon in 1985, and carried the same architecture to China from 1985 onwards, where the Santana remained in production for decades. The table below groups the main applications a purchaser will meet.
| Model | Body | Market | Approx. Years |
|---|---|---|---|
| VW Passat B2 (32B) | Saloon, hatchback, variant | Europe | 1980-1988 |
| VW Santana (32B) | Saloon | Europe | 1981-1985 |
| VW Quantum | Saloon, wagon | North America | 1982-1988 |
| VW Santana / Quantum | Saloon, wagon | Brazil | 1984-2006 / 1985-2002 |
| VW Santana | Saloon, wagon | China | 1985-2012 |
| VW Corsar / Corsar Variant | Saloon, wagon | Mexico | 1984-1988 |
| VW Carat | Saloon | Argentina | 1987-1991 |
The wagon body changed names by market: Quantum in Brazil and the United States, Passat Variant in Europe and Corsar Variant in Mexico. During the AutoLatina years the Brazilian line was also retailed as the Ford Versailles and the Royale wagon. Trade listings occasionally show the wagon name spelled Quantun; both spellings point to the same platform. When a customer quotes any of these names, confirm the platform generation and the rear axle layout before matching the bumper.
Volkswagen part numbers in this suspension family follow a clear logic. Numbers in the 512 131 group are spring bumpers for the rear axle, mounted over the damper rod or beside the spring seat. Numbers in the 412 131 group are bump stops fitted inside the front strut. The prefix records the platform series and the production region, which is why the same rear bumper appears as 321 512 131 in European catalogues and as 327 512 131 on the Santana and Quantum series built outside Europe.
The front strut stop for the same platform carries number 893 412 131 and a catalogue height near 65 mm, very close to the 64.45 mm height of this rear bumper. The two parts look alike in photographs and sit less than one millimetre apart in height, yet they belong to different axles and different service positions. Quoting from a photo alone is the most frequent mistake on this family; always confirm the full number and the axle before offering a price.
European aftermarket catalogues describe the same rear axle bumper family under the 321 512 131 series for the Passat B2 and Santana 32B, and several suppliers also publish an alternate ZBC writing for the reference. The table lists the numbers a purchaser will meet, together with the position each source declares.
| Reference | Type | Source Notes |
|---|---|---|
| 327 512 131 A | OE, rear axle | Santana and Quantum B2 series builds |
| 321 512 131 B / C / D | OE, rear axle | European Passat B2 and Santana 32B catalogues |
| ZBC 512 131 A | OE alternate writing | Published by aftermarket catalogues |
| FEBI 01173 | Aftermarket | Polyurethane version listed for rear axle |
| VAICO V10-6002 | Aftermarket | Supplied as a packing unit of two |
| OPTIMAL F8-5673 | Aftermarket | Rear axle listing for 32B models |
Use the cross numbers as search leads rather than as proof of interchange. Catalogue data for this age of vehicle varies between suppliers, so confirm the bore, outer diameter and free height on the removed part, then match the physical size against the drawing above.
Rubber bumpers age through heat, ozone and repeated compression. The compound hardens, cracks and takes a permanent set, so the suspension reaches the metal stop earlier than designed and the rear of the car starts to knock on rough roads. Polyurethane resists this set and keeps its progressive profile for longer service intervals, which matters on B2 vehicles still in daily use across export markets. For the material background, see the dedicated page on polyurethane bump stops.
| Property | Polyurethane | Standard Rubber |
|---|---|---|
| Resistance to compression set | High | Decreases with age |
| Behaviour in cold climate | Stays stable | Tends to harden |
| Surface cracking under ozone | Limited | Common on aged parts |
| Shape retention in service | Progressive profile kept | Height loss over time |
The design target for this class of part is a service life of eighty thousand kilometres or more under normal road use, with an operating temperature range from minus forty to plus ninety degrees Celsius. Production control includes checks on static stiffness, compression set, hardness and appearance, so replacement pieces arrive with the same response as the first batch. Further chassis parts of the same line are grouped on the chassis and suspension category page.
The fastest route is a direct search on the full number 327512131A in the supplier catalogue. Buyers in European markets often arrive with 321 512 131 D or the ZBC 512 131 A writing instead; both lead to the same rear axle group on the 32B platform. Keep the prefix letter in the enquiry, because catalogue systems treat the suffix as part of the identity.
The vehicle route works through model, axle and year: for example, Santana rear axle bumper for a Brazilian build, or Quantum rear suspension parts for a North American car. The size route suits traders who receive samples without numbers: measure the bore of 18.3 mm, the outer diameter of 51.6 mm and the free height of 64.45 mm on the old piece, then match against the drawing. More damper related components sit on the shock absorber parts page.
Standard production follows the drawing of No 4110060, while the factory also opens custom moulds for variations in height, bore, outer diameter and hardness when a market needs a modified profile. Buyers can order under their own brand, request small trial batches before scaling up and combine mixed items in one shipment. The typical production window of fifteen to thirty days applies to both standard and custom items. Details of the mould service are described on the custom parts page.
Production runs under a quality process aligned with IATF 16949, with incoming polyurethane checks and final inspection of hardness, geometry and appearance. Each piece is packed in a polybag and shipped in neutral export cartons, so the goods move onward under the own brand of the buyer. The standard warranty period is one year, and dispatch of stock items normally falls within the fifteen to thirty day window stated in the specification table.
The number refers to the rear axle spring bumper of the Santana and Quantum series on the B2 platform, including the Brazilian, Chinese and related export builds, with the European 32B rear axle family listed under the parallel 321 series.
Two pieces, one for each side of the rear axle. The part is symmetric in application, and workshops replace both sides together so the two corners keep the same response.
Both numbers describe the rear axle bumper of the B2 family, but they come from different series catalogues. Treat the cross reference as a lead, verify the physical size on the removed part and confirm with the supplier before committing a bulk order.
No. The front strut of the same platform uses a stop in the 412 131 group with a catalogue height near 65 mm. The rear and front parts look similar but belong to different positions, so fitment should follow the axle and the full OE number.
Standard items ship within fifteen to thirty days depending on order size and destination. Custom moulded variations need additional tooling time, which the sales team confirms before production starts.
Wholesalers looking for a dependable source of the Santana and Quantum rear axle bumper can send the OE number, the vehicle data or a sample dimension sheet, and receive a quotation for No 4110060 together with the supporting polyurethane parts of the same suspension family.
