front brake .750 cylinder, rear brake .625 cylinder is std issue jbl. approx. 7/8" thread showing on the left side of adjustable brake bias with the front brake master on the left, rear on the right.
here is a lineup of some of the wilwood offerings. hope this answers your questions.
Wilwood High Performance Disc Brakes - Brake Pad Compound: PolyMatrix A
if you change pads i would contact wilwood about using different compound pads on the discs without resurfacing to see if they are compatible.