Hi I have 2 Master Cylinders bought a few weeks back from GTS. Not sure on the thread form on the MC for the fluid reservoir.
Help please.
Thanks,
Matt
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IIRC itts 7/16

Looking at the RD catalogue they have a link pipe, give them a ring and make sure.

Linky

they're the exact same as the CBS ones (cbs ones aren't wilwood though)

5/16" UNF pushrod thread. 2 1/4" (57mm) Mounting hole centres. 3/8" UNF outlet thread. 7/16" UNF fluid inlet thread. Cast Aluminium.

Thanks both....very helpful.
CBS has the fittings at £6 each!!