Transform your  semi truck interior  with a Transformers Autobot engraved  truck shifter knob. 2-1/8" diameter. Built-in 1/2-13 brass threaded insert. Made of ultra durable Partek resin. Made in the USA.
Choose color from drop down menu.  

Matching  Tractor/Trailer Air Valve Knobs  sold separately.  

See more link for Installation Instructions.
Installation requires shifter adaptor.  Choose 13/18 Speed Shifter Adapter, item 238690 or 9/10 Speed Shifter Adapter, item 238691, sold separately.