The napa #ic7 coil is a externally resisted 6 volt coil and happens to be a good one, you would not need the under dash ressitor with this coil.
The FA49 condensor is for a 37-41 helmet NOT the crab.
Crab condesnor is a FA54 and cap and rotor is cap=FA65 and FA64 rotor . Suggest buiying cap and rotor at same time then filing a bot off the rotor tip to prevent hitting....
Glad to help...
Did you intend to say Internal resisted not External??