Diffs

Hi i,am hoping that somone out there will be able to help me.I have bought 2 rangerover diffs and when i took one of the old ones off it became aparent that there was no way of filling the axle up with oil as my landy does not have fill/level on the back of the axel case. as this was done through the diff itself and the new diffs dont have any fill/level plug. PLEASE PLEASE anybody got any ideas

drill and tap a hole in yer noo diff.. make a threaded boss and weld it on to the diff pan, then drill it. making sure you get all the bits of swarf out.
just try and get it in the right place(height wise) give or take 10mm or so.