Surano: On that circular road just above Lake Vinewood, it should be in a parking space on the east edge of the circle
Super Diamond: Behind Leopold's on Dorset drive; this building is located about two blocks south of the Ponsonby's Clothing (1 of 3) on the map.
Vacca: Spawns in a driveway on Whispymound Drive, just south of Lake Vinewood
Double T: In the LifeInvader parking lot on Boulevard Del Perro, just after where South Blvd Del Perro splits off
Tornado: Not sure of an exact spawnpoint, but I found a bunch of these driving around N Rockford Drive and the Golf Course. Thankfully, with the tail fins, this is the easiest of the 5 vehicles to spot driving around.