Ok- I'm trying to dial in the last few issues on my '80 Z1 Classic. One of them is a leaky rear master cylinder. I checked with Z1 Enterprises and there's nothing available for a rebuild. Their only suggestion is to search Ebay and hope that the Ebay master cylinder is actually useable. Apparently this is an "80 only parts issue. I know there's not a ton of the G's out there but have any of you guys run into this issue?