Thank you all for your knowledgeable input.
Looks like I will try to source the GE 57 bulb locally, and will start compiling a list of parts over the coming weeks/months for S&W. (I am going to try to support our advertisers as much as practical). I'm sure S&W would NOT make enough profit on a $1.85 parts sale to make it worth their while. Seems a bundle order would be best, and I don't have a "parts needed" list containing enough parts as yet. For now, the 2065 will be fine missing one lens.
I have had the Greenberg's "Guide To Repairing Lionel Trains" book suggested as a "go to" for parts #'s and specs/etc. Is that the book I need to in order to have parts diagrams, exploded views, and specs for working on Lionel Postwar so I can be more self-sufficient as the months go by?
Andre