65/66 Dart Tail Lamp Bulb?

67 has the same 4cp output as R5W, but has a plain brass base instead of nickel-plated noncorroding, sloppier filament placement tolerances, and shorter lifespan.

There ain't-never-was no lens melting hazard from the specified 1095 bulb; it doesn't get nearly hot enough to pose any such risk. Put an 1156 or similar in there (same size as 1095, much hotter and brighter) and you're getting a lot closer to the danger zone.