This would do it:
Crusader III AA MkI
Great Britan 1940-1943
Armor: 32mm
Range: 322 km.
Speed: 24-42 km/h (off-road/road)
Armament: Bofors 40mm AA Gun with an autoloader and powered mounting in an open topped turret.
Bofors 40mm AA Gun:
Caliber: 40mm
ROF: 120 rounds/min
Muzzle velocity: 881 m/s
Effective range: 12,500 ft
Maximum Range: 23,600 ft
The Bofors 40 mm gun is a famous anti-aircraft auto-cannon designed by the Swedish firm of Bofors. It was one of the most popular medium-weight anti-aircraft systems during World War II, used by most of the western Allies as well as various other forces. It is often referred to simply as the Bofors gun. The gun fired a 900 g (2 lb) high explosive 40 × 311R (rimmed) shell.