For as long as there have been auto salvage yards there has been parts finders and brokers who find the parts you need for a fee. Sometimes these services use some sort of automated process to e-mail your parts requests to a list of used auto parts dealers.
In other instances these parts finders pay a fee to be on one of the teletype parts lines that connect various used auto parts recyclers to other dealers. Still others simply know the telephone numbers of lots of junkyards and when you call them, they start calling around. Problem is: all 3 types of used parts finders add to the price you have to pay to buy your gently used auto parts.
GreensboroJunkyard.com is a used parts finder of sorts, with the difference being that because you do the dialing you don't have to pay to search for used auto parts. So remember: if you live in the Piedmont Triad Region of North Carolina then you'll always want to start with Greensboro Junkyards.