I found a really good online parts catalog.

[Sqrly]

I came across this site while looking for a "CLIP, E/GATE CHECK LINK #11519066". If you need to know the name and part number, you should be able to find it here.

GMC > EPC Online > Nemiga.com

Parts catalogs. Spare parts catalog EPC Online. GMC.

nemigaparts.com

 

[Mooseman]

Interesting. I tried looking at other catalogues and they don't seem to work, including for the TB. Also seems to only cover older vehicles up to 2013.

Thanks!