I bought these two wheels having been told they were for an "FC" car. At the time, I didn't know there is more than one variation of mounting style. Apparently, these wheels were made to fit the hubs of an RFR (Firman) Chassis, as they have a beveled face that accepts a beveled center nut.
I can't use them, so they are for sale.
$450 USD or $600 CAD plus shipping from either Alberta or Montana.