Ken, I just picked-up my 35-spline outers for $78. I did much research on this subject, I found the aftermarket outers are much to expensive. Why do you want to go aftermarket? Spicer outer should be strong enough (a fellow wheeler is running 44" tire, No problems).....Well, if you need some sources, Try Sam Winer Motors in Ne Ohio @ (330) 628-4881 talk to John, he knows D60s like the back of his hand.....Oh the Spicer pn. 3-82-871.