I have a lot of spare B and D parts, but I doubt if I have what you're looking for since I believe they supply only one in each kit? Anyhoo, I'll have a look!
Another possible alternative would be to tape the surrounding area over (tracing the outline of the wing light opening and simply fill it with c/a (superglue). Fill a little at a time, and finally sand over and polish with a sanding stick. Mind you, I have NOT done that specifically on a B, but have done something very similar. It works, but be patient and diligent, especially with the sanding part!
If you are keen, you can replace it with a piece of clear sprue. Cut a piece of sprue larger than the lens, shape it to fit the opening and glue it in with CA glue. Once dry, file the sprue piece to the contour of the wing and then smooth it down along with the surrounding wing plastic with wet and dry sand paper from coarse down to about 5000 grit. Then brush a clear coat on the lens. You might find it looks better than the original.