Custom shifter knobs for trucks are available for purchase at American Shifter, Twisted Shifterz and Big Rig Chrome Shop. Some of the shifter knobs sold do double duty as shifter knobs for cars but can be adapted for use in semitrucks by the use of special adapters.
American Shifter claims to offer the largest selection of shifter knobs in the world; the company also sells dipsticks, dual-action shifters and personalized shift knobs. Twisted Shifterz also sells matching air brake parking knobs and can supply special order shifter knobs within about four weeks. Big Rig Chrome Shop specializes in knobs and other accessories for semitrucks, selling gear shift knobs, covers, shafts and levers.