One of our competitors has been selling clutch cross shafts for 10 years that don't fit!  In 1999, we were in the middle of a TR6 clutch job when we tried to install one of their shafts - it would bind during use.  What did we do?  Well we found a source of clutch shafts that fit correctly. 

Avoid the hassle, our shafts cost the same and fit properly.