The plastic nut tend to get brittle and break. This is a original part. It does fit various places on the vehicles in the list below. Price is for one nut.
Fits: Audi coupe, avant or sedan , RS2, A4, A4 quattro, S4 and RS4 B5 sedan and avant, A6 / RS 6 C5, A3 / S3 8L, 80, 90, 100, 100 quattro, C2, C3 and C4, 200, (UR) quattro and Sport quattro 1977-2005. Referance for original Audi parts numbers: 443807300A