Courtesy of 97ventureowner:
http://www.impalassforum.com/tech/interior/windowfix/
He went to some trouble to locate the page for me as I have some broken regulator slides. With the part #'s, I was able to go to GMDirect and order the parts. As soon as they get here I'll be pulling door panels on my 92 RM and replacing some slides.
I really appreciate the detective work as I was stumped.