I have a 12 bolt but I cant figure out what the drive size is to fill the rear end. I called Moser today and asked them all kinds of things except for the question I called them about. They told me the fill on the cover is fine to fill but the drain on the front should be removed to prevent overfilling. So What tools an I going to have to buy because I don't have it in my tool box?

 

Don't remember which but it's either 3/8 or 1/2" drive. Just a short extension and long handle ratchet will do the trick.