Do you know where this is?: 2716 Dawson Avenue, Signal Hill, CA 90755
Location of Smart Madness.
See supporting vendor link on lower left side of this page. They know ALL about smarts. If you are not close, they are worth the drive.
Google Maps shows it to be a 5hr and 45 min. drive. Still worth the drive. There is probably some one closer in Los Angeles.
Any legimate front end shop should be able to do a spring install for you. The smart car is pretty simple and could even be done at home with a manual spring compressor. When you get your wheels aligned, make sure the shop has a 4-wheel alignment system. Even though you can't align the rear wheels, you use them for reference to get a straight steering wheel.