Black Old Skool Shift Knob & Automatic Adapter For Auto Gear Shifter Lever for Chrysler PT Cruiser New Sickspeed Auto Adapter paired with an old skool knob. Shift Faster! No more push-button, just push down on the knob to shift gears. Perfectly sized at 2 1/8" diameter, the 4oz design feels ROCK-solid in your hand. Made in the USA. Sickspeed is proud to be America based, and American owned! Installs in seconds!