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I had an ol' 1/2 ton with 15x6 steel wheel's, for what that's worth.
i don't think wheel availability was determined by engine; Basically the standard rim for 1/2 tons was 15 x 6 steel. Aluminum was 15 x 7. Rally was 15 x 8.BTW, the v-6 was not available until 85. i think you meant straight 6?