Here's another tool organizer I use in my espresso machine repair shop. Husky makes a “deep” socket, more or less it is bottomless. I designed this to fit just the MM's and the extension.  It features 2 hooks (no support needed!) to display or hang your special wrench. Don't want to go and lose that thing.

I made a smaller version as a test with some cheapy clear PLA and it seems like it will hold up excellent.  

It's spaced better for the MM socks.