GM Wiring Harness & Headliner Retainer (GM # 15975244) - Package of 20 GM Wiring Harness & Headliner Retainer Clips 15975244 Engine Wiring Harness, Tailgate, Headliner & Air Cleaner Head Diameter: 3/4", Stem Diameter: 5/16", Stem Length: 1-1/16" GM # 15975244 C, E, K, S & T Trucks 1994 - On Pack of 20