Don’t know the early history of the No.1 Mk.2 carrier (11A/4376) but definitely used for carrying photoflashes in Canberra in late 1950s. (see AP.1664A)

Normally fitted with ten fuzing units: five tail (No.3 Mk.1 5D/1823) and five nose (No.2 Mk.1 5D/1478). Carried either five stores (two tiers) or three (single tier).

Length 2ft 8in, Width 2ft 3in, height 1 ft, weighs in at 75-lbs.
A photo would confirm.