OER Parts offers a wide selection of Coils for your 1966 GMC Truck. OER Parts offers 1966 GMC Truck OE Quality Ignition Coil, 1966 GMC Truck Replacement Ignition Coil Premium Quality, 1966 GMC Truck HEI Ignition Coils, 1966 GMC Truck Chrome Ignition Coils, 1966 GMC Truck Zinc Plated Ignition Coil Bracket, 1966 GMC Truck Ignition Coil Resistor, and 1966 GMC Truck Chrome Ignition Coil Bracket & Chrome Coil Cover.