MUSTANG, SEAT MOUNT BOLT 'PINION'
Stainless steel. 1/4-20 X 1/2 threaded with allen head drive. Mounts the rear tab of a 2-up seat to the rear fender nut on late-model H-D with a single screw.

Fits: > 96-21 H-D with 2-up seats & 1/4-20 threads