can anyone please tell me the origin of Transistor ignition coil #522?? the foil lable says Delco Remy on the red side and "ignition coil for transistor ignition" on the silver side, 522, made in USA and sideways the numbers 0790 in white print ...on the back is printed 522 with 12V underneath one other odd thing there are a series of 8 bumps on the top of the outer ring........thanks in advance!! HN