Per Matt Miller at Hobie(paraphrased): It will fit any PA 12 or 14, but is over-sized and due to that... is not a "Direct" replacement in that is exceeds some of the design conditions for the Pa 12 and 14. It extends aft of the handle. It extends aft on the loading skids, so will require careful handling or slight modification for loading using the skids.
This is a optional accessory for added rudder authority. It is not a retrofit or warranty replacement.
Taken from this string: http://www.hobiecat.com/forums/viewtopic.php?f=78&t=50247