82mm. Fits vehicles as following:

Front:
98-05 Passat 1.8T (ALL)
03-04 Passat TDI (BHW)
98-05 Passat 2.8 (ALL)
93-95 90 FWD 2.8
89-95 90Q (ALL)
89-94 100/Q (ALL)
89-91 200Q (ALL)
86-88 5000Q (ALL)
96-01 A4/Q (ALL)
00-04 A6Q 2.7T (APB)
98-04 A6/Q 2.8 (ALL)
97-99 A8 (ABZ)
01-05 Allroad (ALL)
93-94 S4 2.2 (AAN)
00-02 S4 2.7T (APB) from 8D-Y-080 001
95-97 S6 2.2 (AAN)
90-94 V8 (ALL)

Rear:
02-04 Passat W8
89-94 100/Q (ALL)
89-91 200Q (ALL)
02-08 A4/Q (ALL)
00-01 A6Q 2.7T (APB)
98-01 A6/Q 2.8 (ALL)
02-04 A6/Q Rear
97-99 A8 (ABZ)
01-05 Allroad (ALL)
93-94 S4 2.2 (AAN)
95-97 S6 2.2 (AAN)
90-94 V8 (ALL)