The plastic hexagon collar nut tend to get round on the outside and break. This is a original part, not reproduced. It does fit various places on the vehicles in the list below. Price is for one nut.
Fits: Audi coupe, S2 coupe, coupe quattro, cabriolet, avant or sedan, RS2 B3 / B4, A4, A4 quattro, S4 and RS4 B5 / B6 / B7 sedan and avant, A6 / S6 / RS 6 C5, C6, A2 8Z, A3 / S3 8P, Q5 8R / Q7 4L, A8 S8 D2 D3, TT / TTS coupe, roadster 8N, 80, 90, 100, 100 quattro, C3 and S4 / S6 / S6 Plus C4, 200 / V8 C3, R8 Type 42, 1983-2009. Referance for original Audi parts numbers: 171201969 - 171 201 969