Y'know what would be very valuable, if it even exists. How about a cross reference for casting numbers to actual part numbers?
I admit that they are often only one number different, but we've all tried to find a correct center stand at a swap meet. There is a casting number on each leg, and neither has anything to do with the part number for the complete assembly.

"Gosh, it's not a 1/4 20, must be metric."

72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"