You could make your own. Take a 1/4" pipe nipple and cut a groove in the unthreaded end. Then bend some thin sheet over and into the groove, which is a retainer. On the later trucks GM went to a piece of hose, so a pipe nipple with hose barbs, with the hose going up to the frame and bending over, so water doesn't run into it. Lets you drive through water without getting water in the differential.


Fred
52 3600
69 C-10