Maybe you guys can help me out.Went out and got new ball diff out drives because of old ones were starting to get notched.They had both the complete rebuild set with black diff gear and rings and everything needed to complete ball diff but all i needed were the outdrives so they sold me a pair that were sold seperately left and right side outdrives part number 7667 and 7668.Will these work in my b4.1? when looking at them they look a bit different than the ones i have now.The older ones have that concave divot on each side of drive compared to the ones I just bought that have no concave.I'm not worried about having the lightened outdrive just hoping these will work before I do my diff rebuild.Thanks