Single and double semaphores were relatively standard (though varying in height, see Post sizes for NZR semaphores). Bracket signals are a more diverse bunch.  This product provides the main brackets and minor parts (platform support brackets, cranks, railing ends and torsion bar bearings) to cover most needs. See signal kits, BS005 Semaphore Signal parts, and BS012 Handrail stanchion bases (5) for signals.