5.5 on 5 - 4 1/4" center opening
wheels will bolt on fine, look for
some older 1/2 ton Fords, they
have this size, I could get these
from the pick a part for $20 ea.
and if you get some half good
tires to run for a while, all the
better. Most of these wheels
are the "wagon wheel" spoke
looking type, I don't mind but
they look a little old in style.
Back spacing is the distance from
the mounting surface to the bead,
and stock rims have quite a bit so
you should be fine with the Ford
replacements.