If you check the Cdn parts manual I believe it will give the cut-off serial number for the Lucas headlamps. It was fairly early in production that the Lucas headlamps were replaced by the Cdn style headlamps, and it would have been common to replace the oddball lucas assy with the Cdn standard lamp as a replacement part once the vehicle was in service.
I don't have my manual available right now, but the change to Cdn lamps would have been in the first few thousand carriers, if even that many. All 1943 carriers would have had the Cdn lamps, as would most 1942 carriers.
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