Other thing to take into account is that the rear passenger side is approx 10mm lower than the rear drivers. I thought this was unusual so i rang King direct and they advised that it is normal with the falcons. I measured mine
this morning and the back is only 5mm higher than the front with a full tank of fuel.
Goodluck making up your mind
Falcon's have allway's been like this from one side to the other, my XW is like this.