I have found two sources for 1-inch carbon fiber wing tubes:

TnT Landing Gear: http://www.tntlandinggear.com/composite_tubes.htm. The wing tube number is WTC-100 ($48), and the phenolic sleeve for it is SOP-100-C ($13).

Chief Aircraft: http://www.chiefaircraft.com/radio-c...cfwt-1x34.html for $39.95. However, they do not sell a matching sleeve (which seems a bit odd to me).

Note that the TnT tube lists a wall thickness of .042, while the Chief Aircraft tube lists a wall thickness of .035. I don't have enough experience with CF tubes to say whether or not the extra .007 thickness of the TnT tube makes a difference in the real world, or if the TnT sleeve could be used successfully with the Chief Aircraft tube.

I decided to stick with a matched pair and ordered from TnT.

Richard