Again, sorry for the delay in responding. The company I use is local to me, but anyone can order online. I don't know if they ship outside the U.S..
Their website is
www.macqc.comThey make tubing, plates, and any custom shape. They're know for building the carbon fiber products that Lance Armstrong uses on his bikes.
Go to the Rock West Composites store and scroll to the bottom. There you will find their list of stock tubing and plate. I'm thinking about replacing the bone covers on my arm to CF tubing.
As far as the wall thickness, I believe it was .062
I can't remember the model number, and in all likelihood, it has changed or been discontinued, but they should have anything you need. My CF tube cost me a grand total of $45 USD when I bought it four years ago, and the stock size was perfect for the sled. Now I think the stock sizes are larger, and they are a little more expensive.