Article by Fizzle of the XLForum

Installation using V-Twin Primary Chain Adjuster Shoe Kit (18-3220) for 1977-1985 Sportsters. The kit includes all the parts seen in the pics below. I'll explain the extra hardware as I go.
In the hardware pic below (R), There are two steel flat washers and two copper washers for the pivot stud, apparently to provide an extra set. There are two steel flat washers for the adjusting stud, one is extra, and no copper washers, so you should get some to avoid leaks. The two nuts on the bottom left are 3/8“-24 and fit the outer end of the pivot stud. Apparently they're meant for jamming together on the stud in order to tighten it into the case. That end is 3/8-16. I don't know what the #10 split lock washers are for because the small screws that fasten the plastic shoe to the bracket are internal tooth lock washers.