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If you aren't going for a gold star restoration, I would say any old light will work. They didn't change a whole lot from year to year. I have seen 50's models on Ebay. Trouble with them is the bakelite handles are not always the best.
The original spotlight for the M-43 were made by "Guide" but "Unity" looks just the same ( better handle ) and still come up on E-bay now and then ( mostly then ). (pic is Unity in my deuce )