Wilwood conversion problem

Much of this doesn't make sense. The factory intended that the "hub register" fit tight to the wheel, centering the wheel via "hub-centric". Thus, all factory wheels - 13", 14", 15", ralleye, whatever should have the same-size center hole. Thus, if Wilwood states the kit is "for 10" drum" cars, the hub register should be the correct size. I can't tell from your photo which spindle you have. The 9" drum spindle is much different with a curved "goose-neck" coming in from the side (fwd or aft, I forget) when viewing the wheel. Regardless, I don't know that the hub register varied between 9" & 10" drums. If you lookup drums on rockauto (Centric gives dimensions), that would tell you. I would raise heck w/ Wilwood after spending such money. See if "I'm returning your $750 kit" motivates them. Even if thru a distributor, they would have to eat it.

You can still run with wheels centered by the studs (lug-centric), assuming you can get it over the register. You also don't have to give up on SBP wheels. One company makes nice alloy wheels in SPB for ~$170 ea and has posted here.