Looking for rear master cylinder

[PaulAAMRR94]

Hi everyone, my name is Paul, I'm new to this forum! I am in the process of restoring my '77 CB750F, purchased brand new way back when. My rear master cylinder is rusted out and I'm having trouble finding one, Ebay, etc.
I would appreciate any suggestions including advice on a reliable repro or universal fit item...
Thanks much!

 

[brettp]

Welcome from Florida!

4into1.com, cb750supply, and vintagecb750. Should get you started.

 

[PaulAAMRR94]

Thanks for your response
I have looked at those and only found one universal unbranded itek that I'm not sure will do the job.
I was hoping for something a little more specific. Has anyone replaced their rear master cylinder and had good luck with a particular source?
Thanks again.

 

[Loose Chain]

I know you are in the US but try my friend Joe.
https://hoarderjoes.wordpress.com/

 

[Ziggy]

I too am having issues finding a replacement.
The aftermarket master cylinders requires an adapter that is not sold. It has to be manufactured by a machine shop.

 

[grewth]

There's a rather nice F3 for sale on Ebay at the moment, in fact I nearly bought it.
The owner tells me that he had the same problem, but adapted a CBR1000 rear master cylinder to suit.
I'm not sure exactly what was required to make it fit