Billet Heater Knobs


Rennline’s billet aluminum heater control knobs are the perfect inexpensive interior upgrade for any Porsche equipped with this feature. Factory heater control knobs become faded, cracked, and/or unsightly after years of exposure to UV light. Rennline billet knobs are machined from 6061 aluminum and are available in red, silver or black anodized finishes for a durable, long lasting appearance. Simply tap off your old knob, and tap ours on, installation is literally a snap.

Installs in Minutes

Rennline aluminum defrost knobs install in minutes for a seamless oem-like look. You’ll only need basic household tools to remove the old faded plastic knobs.

Billet Aluminum

Rennline interior upgrades are machined from aircraft grade billet aluminum with a brushed matte or anodized finish.

Three Colors

Available in three colors: Red, Silver, and Black with CNC Machined labels. These are the perfect upgrade to compliment your existing Rennline interior.

“The perfect replacement for your faded, cracked and chipped factory cabin defrost knobs”


A little aluminum in the cabin goes a long way. Simply tap off your old knob, tap ours on, and tighten the set screw. Order now at