I have the stock torque tube out of my sold Z06 just sitting around. Nice upgrade for a non-Z06 owner, or use it as a core for a CF prop shaft. Something got bent, so it ate up my pilot bearing. Swapped it out for a CF equipped tube at that point, sold it with the car. The tube is in perfect condition, no cracks or anything like that. The ends seem to be fine, and the bearings spin with no drag. The input shaft wobbles a bit, though.
Willing to ship at buyers expense, located in Dayton, OH. Can work out delivery if within a reasonable distance. I can get pictures, but it just looks like a torque tube.
Trying to fund my track habit, here!