Abstract: A utility line support structure for use as a tangent crossarm or deadend including a hollow fiber reinforced beam with a bushing inserted into a transverse hole in the beam. Bushing includes a hollow inner member for receiving a bolt and a pair of integral washers arranged on opposite ends of inner member and against an outer surface of the beam. The hollow inner member and the integral washers cooperate to support axial loads applied by the bolt. End caps extend over opposite ends of the beam to seal the beam so as to prevent moisture from entering the beam. Also, a method for adapting a non-standard-sized utility line support beam to be compatible with standard-sized tooling.