Product Features: This Momo Gear Knob ONLY Fits Automatic Transmission WITH Press Down Release Button It is a great automobile accessory, which is made of High Quality Aluminum with light weight carbon steel Its unique Design Provides an Elegant and Fashionable Driving Environment This gear knob can recover the performing as well as you used to and better for racing Easy to install and disassemble. If you can't install, please find a professional installation Package with adapters with 3 different sizes ( M12 . M10 , M8 ) Color: Blue Installation Instructions: Remove existing shift knob Select correct adapter and install over shifter Slide shift knob on to shaft , make sure release button works Tighten down with 3 set screws Package include: x3 adapters (Length: 3.8 cm ; Inside Diameter: 0.8 /1.0/ 1.2 /1.4 cm ; Outside Diameter: 1.5 cm) x4 black screws (Size: 0.5 cm ; diameter: 0.4 cm) x1 wrench (Size: 5.1*1.7 cm; Opposite Sides: 2 mm)