Fellas, does this thread remind you of the old "parts guys"?
Remember going into an auto parts store or a tractor shop, and there would be a counter with books and three ring binders stacked everywhere?
And the parts guy would know just where to look to find the part. And he'd grab the big phone to call in the order.
And if you're really old, you might remember this:
You'd go in and buy a battery, but you didn't take it home right then. The parts guy would pull out the battery your spec'd, then fill it with electrolyte and set it on a charger. "Come back in an hour and it will be ready for you."
Good memories . . .