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6X0512131A is the rear suspension stop buffer of the Volkswagen group small car family: the Seat Arosa, the VW Lupo and the first generation Skoda Fabia. The catalogue registers the part under the description Stop buffer, rear suspension, while trade platforms use the names rubber buffer, bump stop and jounce bumper for the same component. It slides over each rear damper rod inside the coil spring and forms the last stage of travel: when the torsion beam axle reaches full compression, the polyurethane column loads progressively and keeps the damper, the spring and the body away from metal to metal contact. Bonpora manufactures the reference as part number 4110010 in polyurethane, a material that holds its progressive rate through years of compression cycles where basic rubber hardens and crumbles. The wider polyurethane programme for the whole chassis line follows the same moulding principles.
The 6X0 prefix belongs to the A00 platform, a shortened version of the Polo underpinnings, so one physical part serves the whole city car family. Catalogue tables cover engines from the 50 hp one litre units to the 130 hp 1.9 TDI RS, and every body style from the three door hatchbacks to the Fabia estate and the Praktik pickup.
| Brand | Model | Bodies | Window |
|---|---|---|---|
| Seat | Arosa 6H | three door hatchback | 1997 to 2004 |
| Volkswagen | Lupo 6X1, 6E1 | hatchback, including GTI and 3L versions | 1998 to 2005 |
| Skoda | Fabia I 6Y2, 6Y3, 6Y5 | hatchback, saloon, Combi estate, Praktik pickup | 1999 to 2008 |
| Audi | A2 8Z0 | attached by trade catalogues, see the note below | 1999 to 2005 |
The Lupo row deserves a remark. The same buffer appears in the parts diagrams of the standard petrol and diesel cars and of the 3L TDI, the ecological version with aluminium and magnesium suspension components that became the first production car below three litres per 100 km. Even the 125 hp Lupo GTI shares the reference, so one stock line covers the run from the base 1.0 to the hottest variant.
The A2 row needs its own explanation, because sources disagree. Trade catalogues from Ridex and Oyodo attach the 6X0512131A buffer with its 120 mm height to the Audi A2. The genuine A2 parts diagrams, quoted by the A2 owners community, name two other references: 6Q0512131B with a recorded height of 123 mm as the standard rear buffer, and 8Z0512131C with 140 mm for cars with the sport suspension under the PR code G22. A further aftermarket listing offers 1J0512131B at 128 mm for the A2 without sports suspension or bad road package.
| Reference | Recorded height | Source context |
|---|---|---|
| 6X0512131A, this article | 120 mm | attached to the A2 by Ridex and Oyodo trade listings |
| 6Q0512131B | 123 mm | standard buffer in the genuine A2 diagrams, PR codes 1GA, 1GF, 1GL, G03, G07, G08 |
| 8Z0512131C | 140 mm | sport suspension buffer, PR code G22 |
| 1J0512131B | 128 mm | aftermarket listing for the A2 without sports or bad road suspension |
The practical rule for an A2 enquiry is therefore simple: never quote from a cross reference list alone. Match the height against the removed buffer and send the VIN or the PR code, because three similar looking parts with millimetre steps sit in the same market.
Published figures for the same part differ slightly, which is normal for moulded elastomer components. The Febi, Ridex and Unigom catalogues record 120 mm, the Volkswagen Classic Parts shop lists a product length of 124 mm with a width of 59 mm, and the Bonpora drawing reads 121.2 mm. Recorded weights range from 72 g to 90 g for the same reason.
Every figure is nominal, taken at a different reference point of the moulding, so treat the numbers as a tolerance band and compare against the removed part rather than against another catalogue page.
The table lists the commercial and technical data of the Bonpora unit next to the catalogue values recorded for the same reference.
| Item | Value |
|---|---|
| OE reference | 6X0512131A, also written 6X0 512 131 A |
| Bonpora part number | 4110010 |
| Fitting position | Rear axle, on the damper rod, left and right |
| Quantity per car | 2 pieces |
| Nominal size, Bonpora drawing data | 12 x 58.1 x 121.2 mm |
| Height, aftermarket catalogues | 120 mm |
| Length, Volkswagen Classic Parts | 124 mm, width 59 mm |
| Bore, inner diameter at the top cup | about 12 mm |
| Weight records | 72 g to 90 g depending on source |
| Material | Polyurethane |
| Engine range covered | about 50 to 130 hp, petrol and diesel |
| Warranty | 1 year |
| Delivery time | 15 to 30 days |
| Packaging | Neutral export packaging |
This reference is widely covered, and the full interchange runs past fifty numbers because the small car platforms of four brands share the part. Interchange lists differ between sellers, so the OE number on the removed buffer stays the safest anchor for a quotation.
| Brand | Number | Recorded data |
|---|---|---|
| Febi Bilstein | 18375 | PU, thickness 120 mm, rear axle left and right, about 90 g |
| SWAG | 30 91 8375 | mirror number of Febi 18375 |
| JP Group | 1152603200 | rubber buffer, rear axle |
| Malò | 17746 | rubber buffer, rear axle |
| TOPRAN | 108 762 | rubber buffer, rear axle |
| VAICO | V10-6034, V10-6034-1 | rubber buffer records |
| Optimal | F8-6002 | rubber buffer, rear axle |
| Ridex | 1182R0044 | height 120 mm, replace in pairs only |
| VIKA | 45120371801 | rubber buffer, rear axle |
| TRW, Boge, Mapco, Unigom | JSK4146T, 89-319-0, 32858, 391896 | equivalent records |
Suppliers package the reference in two forms. A single buffer replaces one worn unit, while a protection kit adds the bellows that keep grit off the damper rod, and the rear cover of this axle family is the 1J0513425 protective pipe, itself a Golf platform part shared across the group. Buyers refreshing a rear axle usually take covers and buffers in one line to save a second shipment.
| Supply form | Examples | Contents |
|---|---|---|
| Single buffer | Febi 18375, VIKA 45120371801, Ridex 1182R0044 | one piece |
| Buffer plus cover kit | Monroe PK078 and PK095, Ridex 919D0005 and 919D0115, GSP 5404992PK, Stark SKDCK kits | covers and buffers |
| Companion dust cover | 1J0513425, 1J0513425A | protective pipe, rear damper |
The dust cover programme lists the rear kits that fit this platform family.
Two details from the catalogue data deserve attention before an order is confirmed. First, the Ridex listing carries vehicle identification number limits for the Skoda Fabia, recorded as 6Y-1-160000 and 6Y-1X012500, together with engine codes ATD, AQW, ATZ, ASZ and AME, which shows that the reference is tied to production ranges rather than to model years alone. Second, the Volkswagen Classic Parts shop places the part in the final Lupo model years from 2004, because the Lupo left production in 2005 and the Arosa in 2004, so surviving cars are all more than twenty years old and held by enthusiasts and city couriers. A buyer who sends the VIN gets the correct reference confirmed in minutes, and mixed orders for the 6Y, 6X and 6H chassis can ship together.
Fitment is straightforward: the buffer pushes fully over the damper rod until the skirt seats against the spring pan, with no fastener of its own. Catalogue data marks the part replace in pairs only and records two pieces per car, one on each side of the torsion beam, so a single side order invites a second shipment and an uneven ride.
A rear damper refresh on these cars opens the whole spring seat area, so the sensible quote includes the protective pipe 1J0513425A, the rear dampers and an inspection of the spring seats in the same visit. The shock absorber parts range groups the neighbouring components, and a cracked cover behind a new buffer will pull grit onto the fresh rod within weeks.
Bonpora produces the 6X0512131A buffer as reference 4110010 to the original geometry and ships worldwide. Standard terms are a one year warranty, delivery in 15 to 30 days and neutral export packaging without third party branding, so distributors sell under their own label. Orders that need a modified durometer, a changed geometry or branded packaging run through the OEM and custom design route, where the mould shop quotes from a sample or a drawing via the custom parts channel, and mixed containers combine this reference with the rest of the chassis range in one shipment.
Aftermarket catalogues record 120 mm, Volkswagen Classic Parts lists 124 mm product length and the Bonpora drawing reads 121.2 mm, with a bore of about 12 mm at the top cup. The figures are nominal measurements taken at different points of the moulding, so match the removed part against the band rather than against one number.
Trade catalogues from Ridex and Oyodo attach it to the A2, but the genuine A2 diagrams list the 123 mm buffer 6Q0512131B for standard suspension and the 140 mm buffer 8Z0512131C for the sport setup under PR code G22. Compare the height of the removed part and quote the VIN before ordering.
Two, one on each side of the rear axle. Catalogues mark the reference replace in pairs only and pack it as a single piece, so order two units per vehicle and inspect both covers while the springs are dropped.
Both belong to the 512 131 buffer family, but the platform prefix separates them: 6X0 belongs to the Arosa, Lupo and Fabia I city car family with a recorded height near 120 mm, while 6Q0 belongs to the later Polo 9N generation and reads 123 mm in the B revision. The height gap and the different spring seats mean the two do not substitute for each other.
Send the reference 6X0512131A or the Bonpora number 4110010 with the quantity and the destination port to receive a factory quotation. Sample orders for workshop testing, distributor programmes and custom designs are handled by the same export team, and the complete rear axle line for the Arosa, Lupo and Fabia platform family ships in mixed containers.
