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looks pretty similar to those snap in license plate lights...
https://www.google.de/search?q=plate+light&biw=1440&bih=708&source=lnms&tbm=isch&sa=X&ei=AY25VLCAKsnWasPUgagK&ved=0CAYQ_AUoAQ#tbm=isch&q=plate+light+snap+in
replace with a 24V bulb, dip it in red glass paint .., paint the housing in...