i have been a GMPD fan for years now, ever since it was brought to my attention by this club. I know the shipping was never the greatest, and the parts are hard to find on their site, but I just figured thats what you get when you are paying half the price of the dealer.
i tried Rock Auto today.
I found the correct O2 sensor, ordered and paid for in a matter of 5 minutes. It was so slick! The search feature is superb compared to GMPD and the order confirmation was much more professional.
Rock Auto replaces GMPD for good in my book.