atlantic towers: air tower 11 I believe
http://www.atlantictowers.com/airtower.htm Call shelley there, she will fix you up with measurements.
Monster tower make nice universal racks, $195 each shipped.
The racks are universal because they come with all the different sized inserts for differing tower diameters.
www.monstertower.com, brad there should be able to give you all the help you need. 770-410-3451
they are quick release and have a 5 year warranty.
Just about any brand will make a rack to fit though, maybe look at wakeside.com for ideas and pricing.
Hope that helps.