These ACCEL Performance Replacement GM Opti-Spark II distributors feature all-new construction with heavy-duty Oil-lite bushings and polished aluminum housings. The ACCEL Performance Replacement GM Opti-Spark II distributors include a high dielectric strength reinforced cap with brass contacts and a balanced rotor. Also included are new pin drive shaft seals, hardware, and easy-to-follow instructions. Replaces the Optispark II vented, pin drive style OEM distributor only.