The most expensive part in this assembly is the Cylinder Assy,rr Master.
Check out any of the thirty-two Rear Master Cylinder components enlisted.
The most reasonably priced component used on the Gsx1100f 1989 (k) (e01 E02 E04 E15 16 17 18 21 22 24 25 34 39 53 Rear Master Cylinder is the Pin.