Oil cooler line on \'90 K5 Buddies truck has a serious leak coming from one of the oil cooler lines. Looks like both the return line and the one to the cooler are identical. Does any know the GM part number for this line? Napa didn't have it....Now its off to the dealer to pay waaaay more than its worth...If I could get the part #, it would greatly speed this up. Don't want to deal with retarded parts guys.