Replacement 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. to see full seat assembly. Finished with the minimum 5 coats of Captains ZSpar varnish.  Includes stainless hardware and fasteners.