VESA Stand Parts?

Alright so I've run into a problem.



Some of you may or may not have seen my desk in the Battle Stations thread. It's not a standard desk and a standard VESA triple monitor solution is not something I can really make work, since most just have a dinky C-clamp that clamps to a normal desk.



In light of this I'm going to have to manufacture my own stand but the problem I have is the mounts. I don't currently have access to tools I would need to make good swivel mounts myself.

 

This lead me to wonder if anyone knows someplace that sells the VESA clamps/swivels on their own that I could clamp to a bar if I made the main stand myself. (Preferably with at least a -10 degree tilt availiable) Something like this, but preferably not $167 a pop, and it doesn't have to have fancy quick releases because once my monitors are in place they'll be staying there.


What would actually be ideal would be something like this arm, but with just the crossbeam and not the fancy vertical pole and base, since I will have to make my own anyway.