The Crusader III was the final production vehicle with a 6 pdr.
Increased armor on hull and turret.
The turret had an extractor fan installed.
In the turret was only the commander, who also loaded the gun on the right side, and the gunner, who also operated the radio. The gunner had one periscope and the commander had two, with one in the roof hatch.
The turret hatch was replaced by a pair that opened outwards.
The smoke charger was changed to fire through the roof in front of the commander.
The turret was longer and taller to handle the 6 pdr. The front plate was vertical, with a rectangular opening for the gun with an internal mantlet. A coaxial Besa machine gun on the left.
Muzzle velocity for the 6 pdr was 2,800'/sec. AP round was 6.28 lb.
The radiators were located between the engine and the fuel tanks. At the rear bulkhead were two fans that drew air over the radiators. There was a jettisonable auxiliary fuel tank at the rear. The tank guards had the cleaners for the carburators.
To help control fire, there was a Pyrene CO2 cylinder.