WTB rear master cylinder for 76-78 CB750F

[graydude]

Looking for the master cylinder for the rear disc brake on a 78 CB750F.  I believe it's the same for the 76 and 77.  Thnaks in advance.  Todd

[shinyribs]

I think I have one. It's clean and useable, but it's disassembled and most likely needs new rubber bits.

I'll check and post back.