I bought a set of the Performance wings for my Prindle 18 and they are actually pretty nice. I liked them enough, I kept them for my 18-2. You install some hard rubber sockets in the crossbars, then the wings slide into them. I found that they aren't really designed for performance (like the Hobie 17), because the angles just seem a little 'off'. Also, the frame pieces for the wings just slide into eachother and really need to be riveted for rigidity. They are cheaper than the Hobie wings, but $1100 still hurts! It's the only way I can get my wife on the boat...