Clutch Master Cylinder

[jimed]

I was at the Tatton Claassic Car show yesterday and was looking at the various bits on a stall with plenty of cylinders. The bloke asked what I was after and I said that as a matter of interest I wondered if he sold S clutch master cylinders also adding that it had a larger than normal output pipe. His comment was "oh yes its the same as Triumph TR6 and is 0.7ins bore". He showed me one the same and it had the larger output pipe size and certainly looked like the one I got last year that had the wrong output pipe fitting (I finished up putting the new guts in the old cylinder as the bore seemed OK and so far all is OK) and on checking when I got home that was 0.7 bore as well so maybe that is the answer to the problem - but has anyone access to a TR6 one for comparison? Whilst I don't need one at the moment it would be useful to know where to get one from that fits without all the messing about.
Jim