Jaguar XK8 / XKR (X100) all 4.0 / 4.2 V8 1996-2006. Jaguar XJ8 / XJR all 3.2/4.0 V8 1997-2002. Jaguar XK / XKR (X150) 4.2 V8 2006-2008 (VIN range B00001 through to B17758). This is the idler pulley for the main engine drive belt - i.e the belt that runs around the Alternator, Power Steering Pump, AC Pump, Water Pump and Crank Shaft pulley.
