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Ballantyne, of Windsor, ON, built several ambulances over the years including this 1962 GMC. Note how the tunnel lights were faired in to the front and rear rooflines. Note also what I'm guessing are warning lights inside the rear doors...perhaps for when the rear tunnel lights are obscured by the open doors?(factory photos)
Here's one 1960´s Fargo ambulance from the another side of the pond:Fargo D100City of Helsinki Fire Dept. Finland(preserved museum piece)photographer unknown
Burlington KY196X IHPhotographer unknown.
Silverton, Ohio Unit 1521970 IH/?AmbulanceSteve Hagy photo.