Fan Wanted

[Bruce Parker (RIP)]

Can anybody assist with or suggest where I might find a similar ventilating fan like this one? It appears to be a black cast iron motor (3" around and 4" long +/-) with a three bladed fan about 6" in diameter. I'm assuming this is probably a common 1940's era fan as used in school buses, etc. 12 volt preferred, but 6 would do.

Also looking for a spare dome-shaped cap (that covers the bulb) for a Festoon lamp, as used on Bren Carrier dashes.

Thanks.