I used '77 Chevy 1/2 ton 4x4 wheels on my '57 GMC with front disk brakes. I didn't need spacers. Finished them off by adding a fake "knock off" to the 4x4 "hub cap", a "GMC" sticker I found on the WWW in the middle of the knock off and a set of "beauty rings".

BTW the hub under the wheel shown in the picture was removed from a '52 Chevy in a local junk yard.
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'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.