yeh not sure mate? intersting thought.......
Are you referring to new or 2nd hand boards?
I believe that with new boards off "the rack" you only get a choice of standard M5's ect.
Personally, Im going glassed fins on my next weapon. I surfed a mates board the other day with glassed fins and noticed a significent drive, flex and release compared to fcs.
Time to get back to basics....