I have to disagree, I have seen the bronze window in an S10 and another one in a Sonoma. Both trucks were 91 or newer because of the one piece grill. I haven't seen the GMC in a while but the S10 is still around so I will try to get a close up look and some pics to confirm.
grey safetey flolitesomebody post up their rear glass part #. It's in the lower right hand corner of the glass (pass side)
grey safetey flolite
as3 28-31
solid tempered coated
dot 18 m89.4