Where to buy bolt-on wheel spacers?

[newbe351]

I already asked this in the '60-'66 Forum, so please delete if double posting is frowned upon. I thought I might get more traction over here....


I need a set of 1" wheel spacers (6 x 5.5") for the rear of a '66 GMC fleet side to correct a wheel back-spacing issue. A search on line provided me with a wealth of information for Toyota or newer Chevy hub-centric spacers with metric studs. I need (want) standard 7/16" lug bolts so I don't have to mess with two separate sets of lug nuts and wheel locks for the front and back. Are there sites/venders that sell wheel spacers for older vehicles with the non-metric studs?

Thanks