A couple of things: 1. You won't find anything to fit except maybe off of a Ford Mustang. Probably would still need spacers. 2. In my opinion.....newer wheels (from the 1990's) don't look good on a Maverick.
Didn't someone post within the last year or so that had the 16" Lacy" Grand Marquis wheels on their car??? I know on models up thru '02, offset was approx same as Ford intermediates of the '60s/'70s... Those are easy to find in the junk yards, wheather you like them or not is another story but base models were supplied with steel wheels and hubcaps...
I have seen those and the Crown Vic "lace" wheels as well used on a Maverick. But.....he would need new/different tires. I would think one could find a set of 15" Cragars out there...or something like that.
Ford Ranger wheels fit. 15x7 I believe. I have this exact set for sale, but we are on opposite coasts.