Additionally, because the 53 1/2 tons used 6 lug wheels and the 53 3/4 tons used 8 lug wheels, the lug positioning on the side spare mount is different. You can't use the 1/2 ton mount with a 3/4 ton wheel and vice-versa.
Jeff Nelson
"Beer is proof that God loves us and wants us to be happy." - Benjamin Franklin "Always do right. This will gratify some people and astonish the rest." - Mark Twain