2004 Pontiac Bonneville Engine: 4.6L V8; Position: Serpentine;. 2005 Pontiac Bonneville Engine: 4.6L V8; Position: Serpentine;. Accessory Drive Belt Idler Pulley. Idler Pulley. IMPORTANT: To confirm that this part fits your vehicle, enter your vehicles Year, Make, Model, Trim and Engine in the Compatibility Table.
