New front master cylinder sight glass O’ring to suit the models listed below. These are not available from BMW

K1 (09/1988 – 08/1993) K100RS 16v (09/1989 – 08/1992)

K1100LT (09/1991 – 08/1999) K1100RS (09/1992 – 08/1996)

R1100RT (09/1994 – 08/2001) R850GS (09/1998 – 08/2000)

R850R (08/1994 – 08/2002) R850RT (09/1996 – 08/2001)