I just saw a recent post in a build thread in which edwardb reported that he found the Tilton 75 master cylinder would not fit in place of the Wilwood. Looking at his photo it's easy to see that would be the case on the right side when using the 75 series. I'm using Tilton 76 series in my Mk5 and they do fit. I think that the conflict that Paul encountered is because the 75s are made to accept a clamp on reservoir or a push in barb fitting. This area at the inlet is more bulky on the 75 than that same area on the 76 and what was probably coming into contact with the square tube on the far right of the footbox. The 75 and 76 are the same internally with the primary difference being that the 76 has 7/16-20 threads at the inlet to accept a banjo fitting which is what I'm using on mine. It will also accept a 7/16-20 O ring fitting with either a barb on AN on the end however I can't speak for how either of those might fit. Two suggestions if you opt to use the 76...(1) on the far right master cylinder install the fitting prior to putting the master into place simply because once it's bolted to the pedal box tool access is limited---the other two are easy to access afterward and (2) either screw the upper studs in the pedal box in another 1/4" or cut them off that amount because you won't be able to get that nut on with the masters seated on the pedal box.

Just FYI

Jeff