Small Bolt Pattern Wheels Don't Fit Wilwood Disc Conversion

I purchased the Wilwood Front Disc conversion for A-bodies with 9" drums. Talked with PST and they said the kit should fit with my wheels. I have 15" Steel Vintique Wheels with SBP. The problem is when I tried to put the wheel back on after installing the disc brake kit, the hole in the center of the wheel is not large enough to fit over the Wilwood hub. The diameter of the hole on the wheel is about 2 1/4" and the hub tapers to around 3". They include a 2mil spacer, but I can't even get the lugs through the bolt holes. Do SBP wheels even exist with a 3" center hole? I called a machine shop and they said around $250 to make the center hole larger on my current wheels. That seems like a lot of $ and i'm not sure if that would compromise the integrity of the wheel.