Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Align the post of the headrest with the holes in the seat back.
Manipulate the posts within the seat back until the posts fall into the holes in the headrest bushing.
Press the headrest all the way into the seat.
Raise the headrest in order to verify that the locks are engaged.

Fig 1: Installing Headrest To Seat Back
Courtesy of GENERAL MOTORS CORP.