I have the board racks that came with the towers but am missing half the mount (the part on the right of the picture, the outside mount and bolts)

I believe the size for my tower is 1 & 7/8". I found a picture of the tower:

To get a replacement part its $100 from Wake Designs, and I'd do without it for that price. Any suggestions for an alternative?

I believe the size for my tower is 1 & 7/8". I found a picture of the tower:

To get a replacement part its $100 from Wake Designs, and I'd do without it for that price. Any suggestions for an alternative?