as far as i know its only available as part of the complete short section of prop shaft thats in your first picture.
not sure if i,m allowed do this but go to this link http://www.grahamgoode.com/cosworth/frparts.htm then open up (brakes suspension and drivetrain) then click on drivetrain
and go to the 4th and 5th item from the bottom of the list (guibo joint) i,m nearly sure this is the same item your looking for,and it may be cheaper than a complete shaft