4 types of windscreen stanchion were used on TR2-3B as follows: -
552181/2 TR2-3 Chrome plated brass; Dzus type using guide plates 552818/9 with Dzus spring
560671/2 TR3A Bolt type Aluminium without guide plates
560627/8 TR3A Chrome plated brass; Bolt type using guide plates 552818-1/9-1 without the Dzus spring
804511/2 TR3A Bolt type Chrome plated brass without guide plates