Hi Monkey Face,
I use several 42-44 Noodle bars, depending on the bike they are on. I use about the same in various model Cinelli's. A 48-c-c is about the largest size they make, and usually available at extra cost. I am Mr. "average" build that rides about a 57-58cm frame size. Works great. Exit said it right for me as well, wide as shoulders just works.

These guys sell a lot of these. You could ask them:
http://hiawathacyclery.com