Hello! Recently the rotor cracked and broke on my 1956 Chrysler 300B. I have been trying to track down a new cap and rotor, but it seems particularly difficult to find. If I search under a 1956 Chrysler New Yorker, plenty of options come up. They both have the 354 ci Hemi in them. Is the difference that one is single points and one is dual points? Would the cap and rotor be different between the two models?