From the web site.
SHOPCHEVYPARTS.COM IS OWNED BY NIMNICHT CHEVROLET CO., AN INDEPENDENT RESELLER OF GENERAL MOTORS PARTS AND ACCESSORIES. THIS SITE IS NOT OWNED OR OPERATED BY GENERAL MOTORS.
I purchased from shopchevyparts.com a couple years ago. No problems. The price was the best I could find at the time even with the exchange at the time. Far better than my discount at my GM dealer. I did pick up in the U.S. though. Seems to me they were located in the Saginaw Michigan area at the time.