Swivel board rack

I stumbled on this rack on ebay but no info on model, year or manufacturer -- anybody know by looking at the pics if this would work on my 2013 OBV? It looks to me like there might be a piece missing that mounts the swivel to the tower.

http://www.ebay.com/itm/231036751541...84.m1438.l2649

"This does not include mounting hardware."

There are definitely parts missing (the arm, tower mounting hrdware)

Looks like the correct rack, but missing some hard to find parts