camp9k - Go back to Summit and look at Wheel Vintiques. They make the factory style steel wheel in a 15x7. The center hub holes are correct and no machining required. Just the wheel installed and it fits great, but the original hub cap will not fit correctly with a 4" back spacing wheel (66 Hub Cap Fits great though), so look for less back spacing.
They come in white, chrome and primed.
I was only looking for 15" at the time, but a 16" may be available as well.
Any Ford Bronco and Jeep CJ wheel will fit your early Bronco. The Dodge 1500 series wheels with the same 5x5.5" Bolt Pattern will fit as well, but you have to make sure the center Hub hole is big enough for your Broncos front Hub.
I ended up going with a 17x7" Dodge wheel for my 76 with Uncut Fenders. The center hole was machined to clear the front Hubs and holes were tapped for the Later Bronco center cap.