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.

"The Americans can always be counted on to do the right thing, once they've tried everything else" Winston Churchill
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
92 BMW K100rs "Gustav"