RED BOOSTER SERVO CLUTCH KIT This kit will make your driving a more pleasurable experience and reduce the effort you'd normally put in from driving your Defender. No more painful knees or feet when you are stuck in slow moving traffic. Designed, engineered and manufactured to the highest standards, Red Booster is a mechanism system that makes it possible for all Defenders to have a servo-assisted clutch. Suitable for.. - Defender TD5 1998-2006 - RIGHT HAND DRIVE Contents / Part numbers.. - 1 x REDBOOSTER KIT - DA3942.