What size are the holes in your wheels? If 5/8", there is a selection of them. Spline ID in the hub is important, as well as length. I found some at a GM dealer, they had no clue what they fit, searched by dimension in their paperwork, had to order 1 ea. as samples 'til I found one that fit.

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.