Rear torsion arm shock stud kit with a 1/2" shock heim shank built in on a 3/8 unf stud.
This eliminates any spacer you might run in your shock to make it fit with the 3/8 through bolt you might run already.
The 9/16 hex on the stud then matches the 9/16 hex nuts in the kit.
Kit consists of
1x 3/8 unf shock stud with 1/2" shock shank
1x 3/8 unf aircraft locking nut
1x 3/8 unf titanium shock nut