wilwood master cylinder size?

[junkdealer2]

As a general rule, residual valves are only required when the master cylinder is mounted even with or below the level of the wheel end components.
Also on a disc/drum or a disc/disc system, a proportioning valve can be avoided by adjusting the bore of the wheel cylinders with rear drums or the caliper bore when a selection is available.
When reliability is key, the less places for leaks the better.