This is what I know about it. The brand is Norman, its roughly 9' ft tall, and it has a counterweight at the end of the arm
http://img214.imageshack.us/img214/6558/dscn1343b.jpg
http://img214.imageshack.us/img214/6558/dscn1343b.jpg
Maybe one of these:
Accessories and Supplies - Stand & Stand Accessories
Manufacturer websites are always a good starting point.