Good luck finding pressure plate for your combo, someone has jury rigged what you have now, and myself, I haven't seen any 4 pin adapters, for 2" splined axles, that's why you got what you got. Where are you located, I'd say your best bet, is to find someone to machine you a pair, I could do it here, but I'd probably need your old ones, to make sure how to make them fit. You might get lucky and find some, but I doubt it. Bob!