I just changed out the 10 bolt in my 86 Suburban to a D44 that was in much better condition. Only problem i've run across so far is the D44 is missing the metal vent tube part that goes into the case. And the vent tube from the 10 bolt is a larger size. Where can I find one of them suckers? Junkyard is a hit and miss thing. Anybody ever purchased this from the dealer?