Did my diff today
Lost my 14mm hex so I googled and found this
http://www.bokchoys.com/differential/14mm_bolt.htm - went to home depot and pick up a bolt and 3 nuts like that. 59 cent for bolt and each nut was 12 cent
I had switch to a magnetic plug last year and here it is after 1 year.. Using redline 70w90. I drove about 6000 miles from last spring.