[factorystock]

Here is the standard 15'' 6 lug wheel used on 10 series, introduced between '61-'62 and used up to '70. Note 3 bumps for hubcap retention and gloss in the original factory applied paint ( it was the spare ). The larger 8 lug was the optional 19.5" solid wheel available on 20 and 30 series from 1960 thru 1968. The last photo is another standard '60-'68 C20-C30 17.5" solid with tire ( same rim Mike1965 added in post #3 ).An angled shot shows the offset ( bulge where hubcap attaches to ) built into these rims. Compare this bulge to newer bump type rims which are much flatter. You'll notice a pattern, 1968 was the last year for the clip type wheels.