I don't think that thing is right part. Doesn't look like mine .
But good tips and few minutes on Googling gave me this.
Limited-time deal: GM 92247215 Black Door Window Switch
https://a.co/d/0qWGkEn
100$ that's 3 times cheaper than on official site
Also found on Rock Auto same item.
I can make a bet if I go to eBay I would get it even cheaper. For me the really cheapest way is to make my own. I have some C terminals and also I have 6 AWG wire, I can get 2 and 4 at work. Battery terminals I can scrap from existing. Probably make my own would be better option because I would be able to tap in directly into metal, I can apply some Zink from Zink batteries so place would not be corroded anymore.