That picture is of the old rudder system.

According to the factory, the new rudder system uses the same rudder blades, but has plastic rudder housings (castings) instead of metal ones. Also, the new rudder system has shorter tiller arms, and they are straight (no Ackerman angle).

The new system is called the EZ Loc (patent pending). http://www.hobiecat.com/support/pdfs/ezlock_wave_instructions.pdf