I don't know if it's the same company, but I used to buy wheel blanks from a place in Stockton, Ca. back in the 70's to build my own dirt-track race car wheels. I made wheel centers out of 1/4" plate, and welded them into the rims at the proper offset, using triangular braces between the lug holes for reinforcement. Heavy, but just about bulletproof when we'd rub wheels on the dirt track! I also added a piece of round rod around the bead area to discourage bead bending. With the driver I had it was a necessity! Things got pretty rough out there, jockeying for position heading into a turn!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!