Master Cylinder Sizes

[usa-69z]

Im setting up a t56 tremec into my 69 using a RAM retrofit hydraulic throwout bearing ,, IM not sure what size master cylinder to use for it? It has to be something small as i havnt much room ,, The willwood units look to be about right but do i use an 5/8 or 3/4 or 1" ?
Is there anything else to consider?



ive emailed Ram with no response.


Gav:)

[BTTBSS]

The Ram web site suggests a 3/4 inch MC for their T-56 retro fit bearing, if you have a different one dig through the site and see what matches. Rule of thumb is that the Throw out bearing and MC should be the same bore. The 3/4 MC seems to be used a lot. When I bought a TKO conversion from Keisler they told me it was 3/4 but when I rebuilt it this year it was actually 7/8ths and worked
fine.