gearbox number could be on a small plate or stamped on box, give it a clean and have a good look, the oil filter is normally on underside of box, so as you look under car you should see it, but some have "paper" type filters, look from the top of engine, to see if you can see round thing with hex nut on top, should be 32mm socket.Good Luck
hope it helps, August 2010
