Only on 1 and two. Fairly certain it just has to do with the diameter of the gear. They are so large the inner blocker ring takes up the space between the outer and the hub. They won't fit on others as I don't think the gear has of enough of a relief on the backside. I have one apart at my shop I can double check and get back to you
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Double Trouble 1976 F-250 3.0 Puller
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