OER Parts offers a wide selection of Coils for your 1966 GMC 1000. OER Parts offers 1966 GMC 1000 OE Quality Ignition Coil, 1966 GMC 1000 Replacement Ignition Coil Premium Quality, 1966 GMC 1000 HEI Ignition Coils, 1966 GMC 1000 Chrome Ignition Coils, 1966 GMC 1000 Zinc Plated Ignition Coil Bracket, 1966 GMC 1000 Ignition Coil Resistor, and 1966 GMC 1000 Chrome Ignition Coil Bracket & Chrome Coil Cover.