Brake master cylinder 13 mm for BMW R2V models.

Main brake cylinder 13 mm diameter,
Fits for BMW:
R 45 and R 65 only 9/80-9/1981 single front brake disc, 
R 80G/S up to 9/1981, 
R 65 and R 80 Monolever with single front brake disc, 
R80GS and R 100GS 1988-1990, 
R100R and R 100/RT Monolever up to 4/1989 double front brake disc

Compare: 32722310784 / 32-72-2-310-784