Small Bolt Pattern Wheels Don't Fit Wilwood Disc Conversion

The hubs on these cars was meant to support the wheel. The lug nuts were intended to hold the wheel to the hub. Somewhere along the way, aftermarket companies started selling wheels that had a center hole (Hub register) LARGER than the hub. Why? This was done as a cost cutting move. They made what they considered a "universal" wheel center that only needed wheel lug holes drilled to be model specific.
Wheels that rely entirely on the lug nuts to support the vehicle do work but are not optimal.
Oddly, Wilwood went the OTHER direction with yours, huh? They used the larger hub probably to use a larger wheel bearing. Your options are limited. This sucks.