I worked at Burt Chevrolet in the mid '70s, parts department. They used 7 and 8 digit part numbers that translated into millions of items, from complete engines to cigarette lighters. It was before my time but as the story goes,.... there was a special order for some type of body trim moulding or something small and cheap, the part numbers were entered wrong and they received an entire frame for a school bus!

Numbers matter.