79 KZ650C Rear Master Cylinder

Hey everybody,
My KZ650C rear master cylinder is leaking. I had it bored and sleeved but I cannot find a piston or a cup that goes on the piston to get it to stop leaking. At this point I'd buy an aftermarket master cylinder, but they're all made in China and the reviews say they suck. Any suggestions?

Some pics of your the rear MC would help to get a replacement MC.

This thread may be of some help:

KZ650C Rear Master Cylinder Rebuild Parts - KZRider Forum - KZRider, KZ, Z1 & Z Motorcycle Enthusiast's Forum

after you advised of this i went and bought one, it is the right diameter but length is shorter i dont know if this is a problem or not. i also picked up a 14mm front master cylinder for cheap and the seal is as far as i can tell the same size, the pic shows the 14mm front kawasaki seal on the left, the original seal on the piston (which to me looks in good nick) and the CBX on the right, as you see the CBX is shorter. I have cleaned the piston up more since the photo and it now looks fine, so i hope when i finally come to refit one of seals does the job, or even better they all will work.

Nice of the company you used to bore and sleeve the M/C to dimensions that parts are no longer available!