It's obviously a conversation piece.

I'd speculate you'll get the answer here: http://www.oursl.com/

Thanks, I'm checking out their forum.

BTW I found out it is NOT for the flight sweep rear deck lid hanger, since that one uses 9mm fasteners.

This has been bugging me since the original post, I never thought about what was in there. They're pretty basic to me. I looked, and looked, too far I think. Now I thought it has to be basic, and low and behold, the battery is held down with two 10mm nuts, and the length of the tool is aprox three inches above the top of the accumulator, for the other half. I think it might be for removing that and that only. I'm not a betting man, and have been mistaken before, but that's my best guess so far.
But why the 11mm drive side...... I'll keep looking

However, it would work for the battery clamp bolts on the side of the tray, since those require a 10mm deep well socket. I looked at them yesterday and didn't put 2+ 2 together