Rear brake master cylinder source?

[slickster]

1980 gl1100 I am "rescuing" ....need a rear master cylinder, mine is toast, knockoff or something else? Tons on ebay, look different than mine though...any help? Thank

[slickster]

I was finally able to get this thing apart by drilling away the piston, bore looks decent, rebuild and hope....

[biguns]

That's good, they were hard to find in decent shape 5 years ago and probably havve gotten more scarce, some have retrofitted the Chinese knockoffs.