I have a 340 motor with a 1972 build date. The car it came out of had power steering and a/c so it has a triple pulley off the crank. I want to go to a single pulley just turning the water pump/alternator belt which lines up with the inner most pulley of the triple pulley. (Have I confused everyone yet?) I ordered what was supposed to be the correct part from a reputable Mopar place but it's the wrong spacing. My question is if there is a correct single pulley out there for this application and how to find it. Thanks.