This is probably old hat for most of you, but I recently bought a 1972 Chrysler 55 HP. It appears to be in good shape overall. The problem is it only came with one of the two coils on it and that one is cracked. I checked my local dealer and he said the coils are no longer available. I've done some looking online, but no success. I'm told a regular 12V automotive/motorcycle coil will work and even hooked one up. It does throw a healthy spark. Any ideas??? Please???