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For research, I prefer Wholesale GM Parts Online, GM Parts Direct or Nemiga Parts.
https://www.wholesalegmpartsonline.com/
https://www.gmpartsdirect.com/
https://nemigaparts.com/cat_spares/epc/chevrolet/
For actually purchasing things, take the part number you found on one of those sites and plug it into Amazon or RockAuto. They're usually the cheapest.