There are basically four main types of ignitions. 1---Various "coil on plug" so thos e coils do you no good. 2...Older "points" (breaker points) also known as "Kettering" ignition. Mostly older coils although of course there were high performance coils over the years. 3...Newer cars using distributors and capacitive discharge, and generally you don't want a "made for purpose" CD system coil in this use