Selling a used stand up paddle board holder from yakima. It'll work for round bars, square bars, or aero bars with the included hardware. Have the key for the locks as well. Really nice if you're looking to upgrade from an inflatable to transport a hard rigid board, just a little sun faded. Might work ok with an inflatable but I don't recommend it.
Link to the same exact product minus a lock set. Firm on price. Can install if you already have a rack and crossbars installed.
https://www.rei.com/product/886881/yakima-supdawg-paddle-board-roof-rack?sku= show contact info
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