K-73 Hook Vinyl-coated triple-prong hook fits 3/4″ square tubing; standard on Designer Series and Rap Rak units. In charcoal grey or black.
SR34 Receptacle Vinyl-coated steel receptacle fits 3/4″ square tubing; accepts ball or T-top  hangers.
R1.5 Receptacle Receptacle fits 1″ O.D. hanger rails. For use with theft-deterrent ball to parallel T-top hangers. In nickel-plated steel.