In 1/35 scale Italeri makes the Mk I, Mk II and Mk III as well as an anti-aircraft Mk III. Revell of Germany also reboxes some.
In 1/48 scale Tamiya makes the Mk I/II (two versions one kit), the Mk III and an anti-aircraft Mk III.
Airfix also reissued their 1976 Crusader Mk III kit in 1/32 scale. It was a remarkably nice kit for its time.
There are also a few in the smaller 1/76 and 1/72 scale Crusaders by Revell of Germany, Airfix, S-model, Hasegawa.
The Mark I & II have that little machine gun turret next to the driver's hatch.