The Mk.5 hull was extended to make room for an internal fuel tank at the rear of the engine compartment.
If I have understood it correctly:
AVRE with 165 mm demolition gun were based on Mk.5 hulls
AVRE with 105 mm L7 gun were based on the Mk.12 hulls (which were Mk.9 fitted with IR equipment and ranging gun (the Mk.9 was a modified Mk.7))
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