I got two hubs from the junkyard the other day for my hub conversion, and one of the hubs has a teethed gear on the backside, while the other one has a gear as well, but it looks different. The gear has more of a roundness to it, basically what I'm trying to say, is both of these are off a mustang, but one is a different year I'm guessin since it looks a bit different. But they look to be the same diameter and teeth count. Will I need the same hubs, or will these two work?