Hey Guys, I used to work with an outfit who supplies virtually any lamp - locomotive, marine whathave-u
www.specialtybulb.com (Langley BC)
Not much of a website, but even if you have no part number, send them a fax sketch of the lamp and any #'s on it, they will have it or get it and at a reasonable price!
(how about a set of locomotive headlamps PAR56 24V - those will light up the sky)