[JM 35 Sedan]

The base distributor is basically the same from '42 - '48, and all that's necessary to use either the "crab" style cap vs. the "rabbit ear" style two piece cap, is to have the correct parts necessay to fasten the caps to the main body of the distributor. The rotors for these distributors are also different for the crab vs. the rabbit ear caps. The crab cap is fastened with a spring clip on each side, while the two piece rabbit ear cap uses a bail wire that snaps over top of the rabbit ear cap and holds the assembly together. The sealing of the crab cap can be improved by using a gasket between cap and distributor body, and placing those rubber cups in place, as Rob mentioned, where the wires exit the crab leg openings. Many folks, including me, prefer the looks and ease of servicing of the crab style cap.