Just bolt onto the existing hole pattern in your tower and choose your favorite Roswell swivel board rack. The Malibu/Axis Board Rack Adapter provides ample clearance through rotation of your swivel board rack from the tower and accessories.
eBay
Here is a used jobe wake rack Used on my rib for one season but never saw a wakeboard unfortunately. Been sat in the summer house since so would benifit from a good clean / polish and wipe over.
eBay