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If I remember right the 1/2t & 3/4t arms have different bolt hole spacing on the spindle so they dont interchange.
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I have a '57 3200. I used arms from a '57 3800. the 3800 arms fit perfectly, with no modifications. The part number for OE arms are the same for all TF trucks. I don't have experience with any other swaps to say it works every time.