Bose Acoustimass adapter

I got a new Bose Acoustimass 10 Series V surround-sound speaker set and was disappointed to find that the speakers mount via a proprietary/non standard system that did NOT fit my "universal" speaker stands.

After calling Bose to ascertain what adapters they offered directly---they'll sell you a $10 (each) adapter that allegedly converts to most speaker mount systems, though theirs puts a sharp 90deg crease in your speaker cables because they didn't design the adapter with a logical path for the wires.

Some quick measurements and this is what I've come up with. They allowed me to have some surface area from which to mount to the brackets that came with the universal speaker stands I'd grabbed.

Final prints were done in ABS so I could smooth (melt) the layers down a bit with acetone to provide more strength.