Not to take away from Turbofish - but I replaced all my window rubber and weatherstripping.
Did it last fall and it was ALL aftermarket NOT GM. GM stuff was (surprise) way too overpriced.
You might find aftermarket is way cheaper. Try Kirbans...or Auto Custom Carpets in Komoka, Ontario, Canada.
Heck - with the US dollar - they'll prolly owe you money if ya order something !!!