I have a bar that looks similar at the attachment point, but is actually tied in to the body via the strut mount. The strut mount accepts the top of a Bilstein RS strut. The PO assembled all this a few years back, and says he got this and other stuff for the car from The Racers Group. I don't think there are any markings on the strut bar to indicate the manufacturer.
I'm sorry I don't have any more information, I just thought this might be an interesting addition to the thread.