These are what's called CCFL (Cold Cathode Fluoro) tubes. The lights are pre-wired and supplied singly and so are the circuit boards which include the red/black input cable, all ready to go with no soldering required. They come in a variety of colours and lengths and provde the back-lighting for LCD computer screens.
The ones I have came from a local electronics shop. Theoretically you have to have one circuit board for each lamp BUT close examination of the original boards in this case revealed they are set up to operate two lamps each - the additional parts are simply not fitted. I had already bought two circuit boards before I realised this so I removed the white output socket and the blue capacitor (at the left hand end of the board above where the lights plug in) from one board and added them to this one - works perfectly and saves room. I have yet to identify the capacitor (appears to be a special high-voltage type marked 3kV) and find loose replacements for both it and the socket but I'm sure it can be done.
One set (lamp plus circuit board) cost me about $23.00 (AU). The lamps do get warm but can be handled comfortably. However, it is wise to keep your fingers away from the output end of the board when it's operating as it can give you a tingle even though it's operating from a 12V supply.
To mount the lamps I had intended to use 3mm clips made for small glass fuses which are easy to get and cheap. For an older vessel like the Titanic I would look at using the yellow tubes or paint these with clear yellow paint - I think the lights of the day would have had a more yellow appearance.
I bought these locally as I say but there are similar products available in the US from Miller Engineering @ http://www.microstru.com/. Well worth a visit before you commit.
Michael