SurfStow SUPRAX XL Kayak/2 SUP Storage System w/Pontoon Mount [50061]SUPRAX XL Kayak 2 SUP Storage System with Pontoon Mount *The product is a tension mount installation and it only works on pontoon rails that are completely square. Please note some of the newer pontoon boats do not have completely square railings. These racks WILL NOT fit those style rails.* Features: Store that big kayak securely, and safely, on the side of your Pontoon boat with YAKRAX Get your kayak to its destination, in style Free up deck space