For the rear I found that the knurl diameter was around .670" This was measured from an old original stud that certain cam out easy, but was still holding well. I ended up going to a knurl diameter of .680" just to make sure. This wasn't available readily in a 9/16" so I made the jump to 5/8" The only other thing to consider is the shoulder length. My Dorman book shows
610-071 Knurl diameter .680" and a shoulder length of 1" overall length of 2 7/8"
611-057 nut worked great and puts the thread right at the end go the nut.
Front was a little tougher... I went with a Dorman number 610-389. Had the right thread and knurl diameter but the shoulder was a little long. I put them in the lathe and turned the shoulder down to 9/16" or .562. I used a 611-054 nut that matches the rear nuts above.
If anyone is having problems getting these locally I would be glad to source them and mail them to you. My lead time was same or next day for all part numbers listed above.
Hope that helps. I also have a Dorman book that list every put number with a picture and all related specs. Give my your numbers and I will find something that works!
