Hy wickedinhere, welcome, if your new 50 series has a 7000 lb front axle you could swap hubs and drums from a 60 series (same wheel bearings). depending on which rear axle your truck has you could do the same swap with the rear hubs and drums, that would give you ten stud on 11 1/4" bolt circle, same as the semi's have, good luck with your truck
