Set includes the drive belt tensioner, idler pulleys and belt. The belt features poly-v grooves that are designed to perfectly match up with the pulleys and tensioner for your Discovery engine. Fits vehicles WITHOUT the Active Cornering Enhancement (ACE) performance system. NOTE: If you're not sure whether your vehicle has ACE, check the power steering reservoir. For vehicles with ACE, the reservoir has two caps, whereas non-ACE vehicles have only one cap on the p/s reservoir.