Not sure if this helps or hinders but my parts lists are as follows:
(1) C60X-03, dated January 1944, lists the carbie as 'Part Number 2135998, Carburetor assembly. (When stocks depleted use 5814938) (Zenith Model 28AV11).
(2) The Illustrated spare parts list for Canadian Armoured Car GM Mk.1, model AC-chassis 8446, dated March 1942, and relevant to contract numbers British: Supply Mechanical 1077; Australian D463/202H; Canadian CDLV 125 and 227, the carbie listed is 'Part Number 2135998, Carburetor assembly (Zenith Model 28AV11).
Neither list (1942 or early 1944) mentions a Carter carbie as an alternative. Note that the 2135998 change to 5814938 was 'when stocks depleted', rather than as a product improvement changeover.
Mike C
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