Alex, my understanding is that the six hole ones were military and the civvy ones were five hole? I don't know for sure, but an example is the Carrier (U.C.)bracket has six holes (covered by your CMP comment)
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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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