PSR's Nissan Patrol GQ-GU Chassis Side Weld On HD Engine Mounts are designed to replace the fragile chassis side engine mounts with a super heavy duty weld on system that allows you to confidently run high power and/or HD engine mounts without the fear of breaking the mount from the chassis. This is common in off road racing or when the car is driven hard resulting in the chassis fatiguing and cracking. The chassis plates are precision cut from 4mm 350MPA plate, while the mount itself is cut from 5mm 350MPA and is ready to accept 4 bolt Patrol mounts.