The drum is carrier specific, and the mounting surface for the sprocket is part of the drum casting. Michael, I think that is correct. BTW, I am not sure of this, but I think the "BB" part numbers are of British origin.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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