Multiply the vertical rail band dimensions on the rail band dimension sheets by 0.8 for a 2" thick board.The knifey railband dimension will work but will track and stick in the wake more than a Boxy railband which will allow you to "slide" up and down a bit.It is your choice which type of rail to shape for your wakesurf board (that's the beauty of building your own boards) but we recommend the Boxy Rails for wakesurfs...