Yes Grigg, I used those measurements. For the modern semi wheels I used 285 mm bolt circle and the 220 mm for the bore, just converted to standard measurements. I did get a response from Bernie:
the adapters are .850 thick and that would be offset.
the adapters are very similar in looks to a 8 hole Chevy that is all over the web, just there is 10 holes in the plates.
I asked him if he had a CAD drawing showing the specs. I think that would be helpful too before plunking down $740 for a set of these.
Then I plan on going the simple route first and get a set of steel wheels before I step up and get aluminum. I'll do the math on the cost difference though. I can get steel wheels for cheap though.
Fred