Here's a copy of the service bulletin on the CRG Camaro site although it pertains to all passenger cars.
http://www.camaros.org/images/hrest/hr_TB69-T-1.jpg
The site also goes on to discuss the head restraint deletion and has an example of a portion of a window sticker with RPO AR1: Less Head Restraint:
http://www.camaros.org/headrest.shtml
Paul