I asked earlier. Don said that they're originals. Sadly, they are no longer available except for Coker re-pops. The "big 'n little" look isn't as simple as it used to be - at least with 15" wheels.
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I saw this problem solved by making custom rims with a wide band that was painted to match the tires. It gave the appearance of a smaller rim with a taller side wall.
Over @ Tim Rein's trim shop yesterday