Some 2007-2015 Mazda CX-9 AWD vehicles may experience vibration during acceleration and/or noise coming from the rear of the vehicle. Due to environmental heat and exhaust system heat, the rear differential mounting rubber may become hardened and cracked. To eliminate this concern, the rubber material has been improved. New/improved rubber mounts are available under P/N L214-28-68XB (right) and L214-28-68YB (left). Mounting rubbers can be replaced without removing the rear differential or propeller shaft.