I've always wanted to find an off the shelf clutch master. I came across this part from a Jaguar. I'm not happy with the reproductions.
https://mossmotors.com/clutch-master...r-girling-type
Jag CLutch Master.jpg
It has the same bore size as the OE part. I'm thinking it's worth a try. I'm interested to know any of your thoughts. Moss is a major parts supplier for British cars in the states.