Yes. GM does have a harware book at the dealer but after you find it is 20 dollars for one box of screws, you are better off finding one from a "wrecker" as you stated.

 

I have had great luck at the dealer with small parts like clips and screws. Usually under a dollar each, just be prepared for them to have to order them. At least the dealer I frequent didn't keep a lot of misc parts for my 02. I haven't needed anything small for the 07 yet.

Sent from my Evo

 

8.60 something a screw, yowch for one screw!?! they started using them in 02 and used on the avalanche as well (I'm assuming sierra too) so I'm sure I'll have some luck at the wrecker!

 

When I bought my truck dropped a new filter in and one of the screws were missing, picked one up at local chevy dealership it was $5.50.

 

Pull one of the others and take it to a hardware store. There is nothing special about the fastener, other than be a torx head if I recall properly....you should be able to match up threads.