Doing the 10 hr. service at 20 hrs. Got that drain plug out of the rear diff with a little cussing, now don't wanna put it back in. Does anyone know the swap over to a socket head bolt; size/length and pitch? Looks like a M9x1.0-10mm. Where the heck do you get one of those to make the next time less stressfull. Thx in advance.