Dorman's Idler Belt Pulleys are engineered to effectively route the serpentine belt for proper alignment with the accessory drive belt, thereby keeping the alternator charging, the water pump running, and the power steering pump and A/C compressor operating properly. Our Idler Pulleys feature a high-quality double-sealed bearing to resist damage from contaminants. Vehicle model years this part fits: Nissan Frontier: 1999, 2000, 2001, 2002, 2003, 2004