The Universal Kit will eliminate the need to measure your spindle.
Air-Tight's Universal Kit comes with (3) different inner dimension
size shims. One or none of the shims may be used in putting
on the stainless steel bushing. Note: The universal kit for
the 5 lug/ 3500lb has 3 shims. The universal kit for the 6 lug/
5200 and the 8 lug 7000lb has 1 shim.