Here’s some of the RPO codes. It may help. You should be able to find the RPO color code on list in glove box. Looks like there’s interior and exterior color codes. Some lists are long.
http://www.angelfire.com/ny2/96transam/rpocodes.html
http://gm-trucks.com/home/content/view/10/30/
http://dieselplace.com/forum/showthread.php?t=109324
http://www.lswon.com/2005/01/26/rpo-code-list-1993-2002/
http://www.angelfire.com/ny2/96transam/rpocodes.html
http://gm-trucks.com/home/content/view/10/30/
http://dieselplace.com/forum/showthread.php?t=109324
http://www.lswon.com/2005/01/26/rpo-code-list-1993-2002/