You're probably thinking about MV lens's. They have a metal backing on he lens that is really hard to get off without ruining the lens. All Lionel postwar plastic slope back tender shells have the rear headlight filled in, so drilling and filing will be needed, if you go that route. I would use a MPC tender shell, should be a easy find (Charlie Nassau, Ebay ). It has a separate casting with the hole and lens already taken care of for a light. Mounting the socket and electrical should be easy.
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