Der Franzose have rear gearbox mounts for Diesel, out of stock of the petrol ones. Does anyone have any idea as to what the difference may be? I would prefer a stiffer one but maybe the Diesel one is softer to better manage the vibration of the Diesel? Previous Diesel engine mounts seem to have been stiffer. Definitely don't want a softer mount. The Diesel mount seem to have extra gusseting in the metal part, maybe this is the only difference?.