This is my type. Memories again. I recall I ended up with no metal strip in one of the pair. I snapped a distributor points file to the right length and used it for a couple of years.. You had to hold the mics to your throat with finger and thumb every time you transmitted.
A Colchester scrap dealer had piles of O2 masks wit mics as well. All unused. Needed for the cold in Tigers.
https://picclick.com/WWII-British-Mi...434491363.html