1981-1983 (maybe others) Petcocks - Karcoma

Is there a current source for a rebuild kit for the Karcoma petcock with the 16x1 threads that came on the 81 to 83 bikes? I searched the forum and found a few posts from a decade back or so that listed a kit that apparently had a disk seal that was too thick and another guy was talking about using a Suzuki part in place of it. I couldn't really determine the path to rebuilding these petcocks. I'm wondering what the best way to go is these days.

I have an 82 430 CR that I ride and an 81 430 CR that I'm slowly restoring and both have leaky Karcoma petcocks. I'd like to keep them in service vs putting on something modern.

https://www.bingcarburetor.com/petcocks.html#/

Thanks!