There were two Comet hull versions:
Type A
With the exhaust venting through the top rear of the vehicle engine deck similar to Cromwell.
 These could be fitted with cowls to redirect exhaust fumes away from the air inlet vents.
 Cowls were usually split into two independent covers, as opposed to the single cover fitted to Cromwell.

Type B
A post-war update with twin fishtail exhaust pipes exiting through holes in the rear facing armoured plate.
 Cowls were no longer required.
 Early Type B Comets had armoured covers over the holes through which the fishtail exhaust pipes would protrude, retaining the older Model A setup.

Other vehicles that were based upon the Comet:
Comet Crocodile
One surviving photo shows a Comet Crocodile.
This mounted a flamethrower and towed a fuel trailer similar to the Churchill Crocodile.
Little is known about it.

FV4401 Contentious
The Comet was used as the basis for the experimental FV4401 Contentious, an air-transportable self-propelled anti-tank gun mounting a 105mm L7 gun in an open mounting on the shortened hull of a Comet, and using the vehicle's hydraulic suspension system to adjust elevation, similar to the method used on the Swedish S-Tank.
One or two prototypes were built and tested before the entire project was cancelled.

Armoured Maintenance Vehicle
The Comet was used South Africa as the bases for a maintenance vehicle for the Olifant Mk1A Main Battle Tank.
It had a crew of four and had a mass of 20 metric tons.
It was powered by an AVI-1790-8 Continental, V12 90°, air cooled, fuel injection engine producing 615kW (852 hP), through an Allison CD 850 automatic three speed (low, high, reverse) transmission and had a maximum speed of 60 km/h.
For its maintenance task it featured a welding machine, a hydrovane (high pressure air and water), a crane (1.5 to 6 metric tons), spare lubricants, 200l water, cutting facilities and carried a spare engine for the Olifant Mk1A. It was also fitted with six smoke grenade launchers (four rearward facing and four forward facing) for self defence.
There were two Comet hull versions:
Type A
With the exhaust venting through the top rear of the vehicle engine deck similar to Cromwell.  These could be fitted with cowls to redirect exhaust fumes away from the air inlet vents.  Cowls were usually split into two independent covers, as opposed to the single cover fitted to Cromwell.
Type B
A post-war update with twin fishtail exhaust pipes exiting through holes in the rear facing armoured plate.  Cowls were no longer required.  Early Type B Comets had armoured covers over the holes through which the fishtail exhaust pipes would protrude, retaining the older Model A setup.
Other vehicles that were based upon the Comet:
Comet Crocodile
One surviving photo shows a Comet Crocodile. This mounted a flamethrower and towed a fuel trailer similar to the Churchill Crocodile. Little is known about it.
FV4401 Contentious
The Comet was used as the basis for the experimental FV4401 Contentious, an air-transportable self-propelled anti-tank gun mounting a 105mm L7 gun in an open mounting on the shortened hull of a Comet, and using the vehicle's hydraulic suspension system to adjust elevation, similar to the method used on the Swedish S-Tank. One or two prototypes were built and tested before the entire project was cancelled.
Armoured Maintenance Vehicle
The Comet was used South Africa as the bases for a maintenance vehicle for the Olifant Mk1A Main Battle Tank. It had a crew of four and had a mass of 20 metric tons. It was powered by an AVI-1790-8 Continental, V12 90°, air cooled, fuel injection engine producing 615kW (852 hP), through an Allison CD 850 automatic three speed (low, high, reverse) transmission and had a maximum speed of 60 km/h. For its maintenance task it featured a welding machine, a hydrovane (high pressure air and water), a crane (1.5 to 6 metric tons), spare lubricants, 200l water, cutting facilities and carried a spare engine for the Olifant Mk1A. It was also fitted with six smoke grenade launchers (four rearward facing and four forward facing) for self defence.
Comet (tank)