1974 is a one year only module: D4AZ12A199C.

1975 is a one year only module: D5AZ12A199C except on some early 1976 Bronco's which use this same module.

1976/79: Most cars/trucks use the same BLUE module (1U2Z12A199A replaced D9VZ12A199A).

1976/79: Some cars/trucks sold new in CA use a different RED module: D7AZ12A199A.

1978/79: Some cars/trucks use a BROWN module: D9AZ12A199C / 1979 LTD/Mercury Grand Marquis sold new in CA use: D9AZ12A199B.

Blue/Red/Brown: Above where the wires feed out of the module, is a colored plastic square.