OER Parts offers a wide selection of Coils for your 1991 Mercury Colony Park. OER Parts offers 1991 Mercury Colony Park OE Quality Ignition Coil, 1991 Mercury Colony Park Replacement Ignition Coil Premium Quality, 1991 Mercury Colony Park HEI Ignition Coils, 1991 Mercury Colony Park Chrome Ignition Coils, 1991 Mercury Colony Park Zinc Plated Ignition Coil Bracket, 1991 Mercury Colony Park Ignition Coil Resistor, and 1991 Mercury Colony Park Chrome Ignition Coil Bracket & Chrome Coil Cover.