What are these center caps and wheels?

Wanted to ad those are mopar wheels of some type. Ford plain steel wheels will be stamped with a "fomoco" inside an oval shaped outline somewhere and their center hole has to be opened up to fit the mopar axle registers and brake disks. The original application is anyones guess. If they are 15x7 and have three holes where these centers bolt on instead of the five like the 16 slot road wheels these centers usually came on, my guess is they are early 80's dodge truck. But pure guess.