I was browsing automotiveforums.com and ran across this:
Also, if you need a Delco part, I work for a Delco distributor in Flint, MI and we will match their price, and only charge you actual UPS charges to ship, no extra "handling" charge. Our number is 1-800-852-6933, and ask for Rich, as I get a small commission for all over the counter/over the phone sales.
He is speaking of matching GMPD prices. How does one know what is a Delco part versus any other?