The Napa Echlin IC18 ignition coil is designed for vintage Pontiac Ventura, Sunbird, and Chevrolet Corvette models. It is a front placement distributor coil manufactured in the United States by NAPA/ECHLIN. The coil does not require an external resistor and is compatible with various interchange part numbers such as 36-1118, E43, and D555A. This ignition coil is a high-quality replacement part that meets OE/OEM specifications for reliable performance in your vehicle's ignition system.