Flickr has been an excellent resource for finding new cars to photograph in San Francisco. Frequently it's because some automotive-minded city resident carries a camera around everywhere and takes a picture or two of almost every interesting vehicle they encounter. I like to challenge myself to figure out where the picture was taken based on the background. Then I go there with my camera. It's a crap shoot, really. The nature of street-parked vehicles is that they move around. It's very common for me to go out in search of a specific list of vehicles to locate and photograph, and I go home at the end of the day with an entirely different crop of cars because none of the ones I planned to shoot were there.
I had a hunch one day while I was in the city with a friend. We were sightseeing and after visiting COIT Tower we explored Telegraph Hill looking for the famous red and green parrots that live there and like to eat berries off of some bushes that grow at the top of Montgomery Street. I also knew from Flickr that a vintage Land Rover military ambulance lived in the area. Lo and behold, I found it.