The Crown Vic 18 hole cop car wheels are 16 x 7 and were available on Explorers, Mercury Grand Marquis, etc. Not too expensive. The rub is the center bore is a little small. I run them on my '64Dog. They bolted right on the rear, need a slim spacer on the fronts to bypass the center hub fit. Or you could open them up a bit.
See picture:

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