As far as the rack goes, i have had good luck buying them(three that i can remember) new or reman from autozone/ NAPA etc. Usually $100-$150 Order one from a year that you know they were available otherwise, the parts jockey behind the counter may go in to a coma trying to figure it out. sometimes they have a core charge, i just give them some crappy powere rack, they never know the difference.(or care)
probably have better luck finding the coupler here.
Good luck
Seth