This is a Complete Cigarette Lighter Assembly for 1940-1946 Chevrolet & GMC Trucks. This assembly will also fit 1937-1948 passenger vehicles, as a replacement. This part comes complete with socket, element & knob, ready to install. The knob is available in the factory original rose tan, black, ivory or maroon. Specify color when ordering. Dimensions: 7/8" Hole Size with 1-1/16" OD. Replaces GM# 986050, 985133, 985679