Okay, I finally found out the manufacturer of this weird shower arm configuration --- It's a Symmons NU-Arm #301.
Looks like it'll need a male-male adapter for a standard shower head to attach to it... didn't notice that on my old unit but it's probably non-removable by now.
Note- Symmons is based in Massachusetts (you guys outside of MA are lucky enough to not have this product foisted upon you!)
Last edited by dacquery; 02-04-2011 at 10:38 AM.
Reason: Adding nu-arm image.