build or buy the 4 bolt to 2 bolt alum adapter plate/select a M/C of the correct bore size to give you the amt of pedal force you are comfortable w & the large one (1&1/8") is too much and there are only several sizes to choose from. Make sure the piston recess has the wide shallow groove for the piece of neoprene retainer to lock into (PB ones have a tapered recess w no groove like the inside of a sewing thimble) and get an iron one (rebuilt ones have reported probs but I've had good luck w em) or Dr Diff (on here) can sell you an alum one w several diff bore sizes to choose from if you want to loose some weight. A piece of vacuum line the same length as the machined recess on the end of the pushrod works fine & is identical to an OE one ex for a thin groove down the length of OE ones which does not affect anything afaik & is prob a machining/manufacturing deal of some sort