OldSub beat me to it. Yeah, Stockton Wheel. I researched this a few months ago. There's a bunch of ugly, retarded looking wheels in 15" for 8 lug at places like Summit. Stockton Wheel is about the only place that has a traditional stock steel wheel in varying sizes.
Are you not interested in 16 or 16.5? Those are plentiful in the boneyards.
I wanted a 15" so I could do some L78-15 wide whitewalls but, have since decided to do bias blackwalls in 16 or 16.5 because of 8 lug availability in this size.


Tradin' up dimes for nickels...
'`'`'`'`'`'`
My \'65 Chevy C-20