Hub Steering Wheel Adaptor ...

I had the same problem when I bought a small wheel with the momo bolt pattern.
Weeks spent searching for adapter to 67 a-body column. Its aluminum, about a inch tall with rings cut in the profile. Somewhere between 30 and 40 bucks I think.
Beyond that I had to hunt down a source for the screws since the metric pitch in the adapter didn't match the screws that came with the wheel.
Hope you have better luck.