Did Canada manufacture the Niphan plugs? If so then be careful because they might not match the British connectors , eg the pin spacing on the Aust. made niphan plugs is different .
I have two of the British male Niphan plugs , salvaged from one of the artillery speaker system units. I checked the plugs in my British 6V batteries ( the drawings I did ) and the plugs fitted perfectly .
You may have to think about remanufacture , being a hobby machinist myself, making those plugs its not as easy as it looks
A group buy would be a better deal. A CNC machine could spit them out , but if made in brass like the originals the cost would be ridiculous .