exterior scare light lenses

I am looking for clear lenses for the exterior scarelights for our 62 tradewind. The old lenses measure 4 1/4 inches and the pieces that are there are held in with 4 screws. It has four of the lights, which seems odd, since all of the tradewind pictures I see have one or two. Maybe it was owned by someone who had a lot of nosey neighbors.Anyway, I see ads for a lot of ones that use 3 holding screws but not with 4 screws. Any suggestions. thanks, bill b.