Pico 5633PT 1985-1991 GM Gray Ignition Coil Repair Harness Two Lead Wiring Pigtail (12101896) Buick, Cad and Chevrolet 1985-1991 Fits Coil 1115315 and 1115317 Two leads, One 18 Gauge and One 12 Gauge Replaces GM 12101896 and Delco PT166