This (one) Rear Wheel Cylinder is new and will fit the following Audi vehicles:
331611053 / 6N0611053 are the same items.

Audi 4000

year		position
1980	To 10/79	Rear	17mm
1985	w/ HD Brakes	Rear	17mm
1986	w/ HD Brakes	Rear	17mm
1987	w/ HD Brakes	Rear	17mm

Audi 5000

year		position
1978		Rear	17mm
1979		Rear	17mm
1980		Rear	17mm
1981		Rear	17mm
1982		Rear	17mm
1983		Rear	17mm
1984		Rear	17mm
1985		Rear	17mm

Audi Coupe

year		position
1985		Rear	17mm
1986		Rear	17mm
1987		Rear	17mm

Audi Fox

year		position
1975		Rear	17mm
1976		Rear	17mm
1977		Rear	17mm
1978		Rear	17mm
1979		Rear	17mm

On Jun-11-13 at 12:58:22 PDT, seller added the following information:

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