A removable boat seat attachment having a seat rotatably mounted on a base member which is selectively extendable in length to accommodate different widths of thwarts. The base member has thwart or seat board engaging members which co-operate with an adjustable clamp having thwart or seat board engaging portions wherein the base member and the clamp co-operate to engage opposite edges of the thwart or seat board for securing the base member thereto. Quick release locking type fasteners have portions secured to the base member and the clamp operable for urging and normally maintaining the thwart engaging portions in clamping engagement and removably securing the boat seat attachment thereto.
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