Yeah, I appreciate Geoff’s response and the info provided, but I was already thinking of alternatives to avoid drilling holes. My headlight buckets are in very good condition, but I noticed some surface rust inside when I had to change a sealed beam recently. there is very little plating on the inside of the buckets. I was actually considering masking them and using “undercoat” to spray the inside to prevent further rusting.
Luckily I live in a part of the world where climate is not much of a factor in deterioration of vehicles.