Unfortunately I dont have anything that shows the plunger models from '53 onwards with that nacelle.
I have bikes with that particular nacelle and I have to say I dont think it was one of BSA's better designs. I had a '53 plunger A10 and I had the "ears" with a seperate headlight on it for the years I owned it, I put the original set up back on just before I sold it.
I'll add a couple of pics of the bike with the different set ups.