Check the listing for details. ACCEL 140003 Supercoil GM HEI Ignition Coil 1973-1991 Red/Yellow Primary Wire. Condition: New, Made in Vietnam. Listed at 77.45 USD. Compatible with 1973-1991 Chevrolet®, Pontiac, Oldsmobile, Buick, Cadillac and GMC 90 degree V6 & most V8 with HEI in-cap. This product is not created or sold by Chevrolet®, Pontiac, Buick, Oldsmobile, Cadillac, or GMC.; Engineered for higher energy output resulting in quicker starting, improved idle quality, crisper throttle response and more high RPM power. Compatible with both original HEI ignition systems and later model computer controlled HEI systems. Direct plug in replacement with no need to remove or re-time distributor. Advanced bobbin technology with high specialized silicone magnetic steel core. Complete with simplified ground strap, mounting screws, silicone coil gasket and carbon contact brush / spring.