Hi Really hope someone can help us please. We've changed the lower suspension arm & the drive shaft popped out! Now need to refill Gear Box oil but can't identify the filler point? Have got a manual, but not helpful as shows completely different plugs. Our drain plug is at the bottom side, not underneath & needs a square tool to undo. Can not find where to refill oil for gear box - can anyone help please? As manual is just not same! Crazy.