You may want to check out Ace Hardware. They have some round stock and plate stock Aluminum and if make a mount out of these parts for rather low cost. Buy the proper diameter then cut the cylinder to the proper length, then drill and tap 2 or 3 holes in one end. At that point you can bolt a piece of plate stock to the cylinder, countersink drill the holes to both mount the plate to the cylinder and to mount the plate to the boat ( that mount fit the flat side of the Supra oval towers.). If you are mounting the rack to a round bar - you would have to get more inventive. Maybe buy a monster tower clamp, take out their stainless insert and put another piece in that is round instead of the 4 sided it ships with.}
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