While I'd confirm the measurements before plopping down the cash or driving cross country for these - they appear to be
four K5/10 4 nub wheels for $95 (total) (i.e. disk brake 6 lug wheels). These won't last long.
If I lived closer, I'd actually consider this. How many times have you said to yourself, "I sure wish I had the right pulley for this setup"? Well, here ya go
Pulley/Bracket Lot $350 (listed as all sbc/bbc parts)