Genuine Fender Bi-Flex Truss Rod Cavity Dowel Plugs - 1 Pair &ndash; Walnut Walnut 2 per package Used to plug the Bi-Flex truss rod cavity on the headstock of most American and American Deluxe Series guitars. Note: Plugs are drilled and grooved, but may require modification for proper fit Fender Part Number: 002-7932-049