Triumph TR4A Master Cylinders
Fairly straightforward to fit. If you can fit them before bolting down the pedal box it would be easier. The rear bolts at the bottom of the cylinders are a bet of a mission to tighten up. I have a really cool socket drive that let's you twist the handle to do the nut up. It is great for tight spaces where you can't lever the ratchet drive in the usual way.