as brom says, no need to change the gearbox mount from your box section really, as it doesn't do much. the engine mounts take the torque as they are much further away from the centre of rotation

but if there's one off the shelf that's cheap enough, then may as well do it

why keep the part number to pm though? don't we share knowledge on this site? isn't that the founding principle behind it? a reference site for ford enthusiasts it says at the top of the page