Red/Black Rally Stripe Shift Knob & Automatic Adapter For Auto Gear Shifter for Chrysler PT Cruiser New Sickspeed Auto Adapter paired with a rally stripe 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. Installs in seconds!