Andrew, incase you dont know, the bulbs before these were what they called prefocus. The installer adjusted the bulb in the holder to the best set up and then tightened the clamp band.
These came along after the Prefocus and it matters where the mount flange is soldered on, in relation to the filaments.
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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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