Her Derek,
That version was fitted for firing the 3" as shown in your photo with a base mounting on the deck. They also carriered a standard 3" SB Mortar Base Plate on the gunner side of the vehicle attached to the outer hull about mid-body for when the mortar was to be fired dismounted.
Think he is looking for the 2" type that mounted in the gunner compartment though. Normally used in place of the larger and earlier traditional smoke discharger.
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