I have a 2020 Moomba Craz. It did not come with board racks. I ordered Wake/surf racks and mag swivels from Roswell. When you look at The Moomba A3 Tower page on Roswell's site, there is what appears to be a spacer between the swivel and the board rack backing plate. I cannot find this part to order. Is it needed or not necessary? Anyone with a similar experience?