[72K5454]

I am wanting to run the Indy slots on my 1972 Blazer. It has new stock height springs and shocks. I know they offer a 15 x8 six lug wheel that will fit32-33 inch by 12.5 with the 4"backspacing. My question is has anyone ran the 17 x 9 inch with the 3.74" back spacing? If they do fit, I can only find these wheels in blanks. In researching these it looked like they used to be offered by a guy selling 6 lug by 5.5 on ebay a few years back. His site no longer exist on ebay. Has anyone ever had blank wheels machined out. What is all involved, and how much should I expect to pay to have this done?