OER Parts offers a wide selection of Coils for your 1990 Mercury Cougar. OER Parts offers 1990 Mercury Cougar OE Quality Ignition Coil, 1990 Mercury Cougar Replacement Ignition Coil Premium Quality, 1990 Mercury Cougar HEI Ignition Coils, 1990 Mercury Cougar Chrome Ignition Coils, 1990 Mercury Cougar Zinc Plated Ignition Coil Bracket, 1990 Mercury Cougar Ignition Coil Resistor, and 1990 Mercury Cougar Chrome Ignition Coil Bracket & Chrome Coil Cover.