I agree with the guys above. Get the Porterfields. The tab on the rear pads, as Joules said, is needed to prevent the calliper piston from rotating and losing pressure. Since Porterfields add them at no cost, it's easy (as long as you remember to ask for them that way).
Combined with a change to the braided stainless flex lines, the result was a HUGE improvement in braking. Everything fit like a charm and it was one of the best time/dollar/results upgrades I've done yet to my car.
Also, if you want to avoid a new Master, don't push the pedal hard to the floor when bleeding the brakes or you run the risk of scoring the inner parts of the MC by pushing the piston farther than it would normally go. Good luck!
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