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Boston Whaler mahogany L-BRACKETS for optional Sport backrest. Will fit all classic Boston Whaler 13 & 15 hulls from 1958 - 1998. These brackets support the optional backrest that screws to the existing thwart seat. It is highly recommended to also use 5200 Adhesive to secure the brackets. The backrest angle is approximately 105 degrees. Click here to see full seat assembly. Everything is pre-varnished and ready to install and comes with stainless hardware and fasteners.