I found this resource accidentally, and posted it in a discussion about trim options, but I don't think it should be allowed to fade away. Dealer Information Kits by model year.
Credit goes to GM Heritage Center for this killer collection.
1985 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1986 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1987 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1988 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1989 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1990 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1991 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1992 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1993 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1994 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1995 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1996 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1997 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1998 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
1999 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
2000 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
2001 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
2002 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
2003 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
2004 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf
2005 https://www.gmheritagecenter.com/docs/g ... ro-Van.pdf