You guys with OCD are looking at this the wrong way. Are you trying to organize YOUR tools, or are you trying to set up a display of someone elses? Do you not like to drive your car if you don't have people to sit in all the other seats? I love to buy tools, but buying tools just to sit on the peg of a socket holder is crazy. If you don't want to shorten your trays, maybe black out the sizes of the ones you won't use or shorten the studs a little and use the open spot to store duplicates or whatever.
Jim
Maybe there's another way to be OCD here.
Let's say I owned a 1970 SS454 Chevelle convertible (which, actually, is one of the few non-Camarostangs I've had). A person could take the factory assembly manual, make a list of every connector in the car, and buy a full set of wrenches/sockets for just those sizes. Add some pliers, a couple of hammers, 2-3 screwdrivers.
Then you put the whole deal into a small hand carry box, and call it done.
Seriously, I wonder how many sockets and wrenches bought in sets ever get used by people at home.