Something else to consider if you are looking for a newer flywheel; 1942-1954 flywheels have 139 teeth and were designed for 6 volt starters only. The 1955-1962 flywheels have 168 teeth and will work with 12-volt starters only. Starters and flywheels cannot be mismatched or they will not mesh properly. Also a non-stomp car starter will not mesh properly (stomp starters were used in trucks thru 1959).
If your truck has been converted to 12-volt system, it can spin the 6-volt starter with no problems as long as the starter is connected to the correct flywheel.
