The auto junkyards of my childhood left the identification and evaluation of the parts to the customer: the parts were left on the car; the customer located, then removed the part he or she needed, then brought it to the office.
Those junkyards are getting few and far between because of liability insurance costs. Now the parts have to be ordered and pulled off for you, which makes it uneconomical for low value parts. Often, just the high value parts are pulled and the car is crushed.