The A could be replaced if the car owner used the car for a living.
The B was issued for small busineses,
C was actually the most common as it was a mileage ration instead of a gas ration and was for anyone who used their car in their work.
The T sticker was for either farm trucks or delivery trucks.
The X sticker was used by senators or congressmen. We have been unable to verify the purpose for the S sticker although it was reported to be used by lawyers and judges.
The M was for motorcycles