This is all very helpful (mostly NOT) but even though there are slight variations between CMC, VS and Beck, those last two might be your only sources for a lid for your project and you can correct any differences with sanding disks and bondo.
I would call Greg Leach and Carey Hines and see what you can negotiate.
Unless @Alan Merklin has one kicking around (which I doubt very much, but’cha nevah know).