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The '42 crab cap distributor had two spring clips that held the cap in place. The rabbit ear cap with two openings for wires had a single bail that held its two caps to the distributor body. The earlier helmet distributors had two bails, one on each side to hold its two inner and two outer caps in place.
Many of the suppliers sell a kit with all parts and pieces required to convert the rabbit ear caps back to a crab cap. You also need to change the rotor.