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Those wheels cleaned up really well, that's a good looking truck too.A couple of thoughts I have to offer:If you want to keep the factory wheels, there are still quite a few 16.5" tire widths and tread designs available in bias ply. I still run bias ply on a couple of my old trucks; the ride isn't bad. Power King is one company that still offers bias ply in 16.5"If you want to go with 16" wheels and keep the stock look, most factory installed 16" 8-lug wheels from 70's -80's Chevy/GMC, Ford, Dodge, International trucks and vans will swap onto your truck and take the stock hubcaps.
Pretty much any stock GM/Ford/Dodge truck, van, Suburban from the 70's up to the 90's, that was 8-lug should accept the stock hubcaps. My '73 GMC has wheels that were original equipment on a '92 or '93 Dodge 3/4 ton pickup. You could look for 16" 8-lug wheels from: 70's and 80's Chevrolet/GMC C-20/K-20 and SRW C-30/K-30 and up to '91 C-20/K-20 Suburban; 80's U.S. Army CUCV Chevy Pickups; 70's through 90's Chevy/GMC 20 and SRW 30 Vans 70's - 1997 Ford F-250 or SRW F-350 pickup; 70's through 90's Ford Econoline E-250 and SRW E-350; 70's through 1993 Dodge D250/W250 and SRW D350/W350 trucks; 70's through 90's Dodge B250/B350 vans. SRW=single rear wheel (i.e., not dually)Hope this helps... Good luck and keep us posted!