6-Speed Billiard Ball Black Knob w/Pattern 2" Diameter Will Fit: 1997-2004 C5 Corvette These black billiard ball shifter knobs fit the factory C5 Corvette shifter (1997-2004). They also fit any shifter that has the same thread pattern on the handle including our popular 6-speed shifter. These are made in the USA from the same material billiard balls are made from. It is a special formulated partek resin. By using this material the knob will not get real hot in the summer nor real cold in the winter. It is also fade resistant. Both sizes feature the 6-speed shift pattern engraved in the top. Each knob comes with the correct internal thread pattern and a special jam nut is included with each knob. Directions include a detailed explanation on the easiest method to remove the original factory knob. The two sizes we have available are 2" diameter and 2.25" diameter. Either knob looks great no matter what color your interior is.