I dont know much about them ,but the O.P. carriers had them.
They were mounted in the corner as you say, the steel rod swung up and clipped into place. the clip appears different between the riveted and welded O.P.s. I have no idea what the light looks like.
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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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