correct me if im wrong, but arent older (87 down) supposed to fit on newer 88 up axles? Ive got a newer axle, but wanted disc brakes, so i put older hubs on but they wont go on all the way. The bearings are on all the way, 100% sure. But It seems that the older hub is wider, because the spindle only sticks out about 1/2 inch once the hub is on. Help please.