I have two board racks for sale. They are made by "Nice Rack"
http://www.nice-rack.com/wakeboard.html I had em on my factory Epic tower for 5 years then went to an aftermarket tower with built in board racks so I have no need for these anymore. They fit our boats nicely, and will fit other towers with 1 5/8" horizontal tubing. Never in 5 years did they move a millimeter, good clamps. I polished them up by hand as best I could and I think they look pretty good if I do say so myself
They are billet aluminum clamps and forks with chrome centersection. Bungees are in good condition.
I'd like to get $150 a piece, of $250 for the pair. I paid about $275 each 5 years ago.