Mike:
Our cars were only built in 2 plants: Hamtramck or Los Angeles. So quite a few cars were built in the LA plant that were not for sale in California.
HemiOrange70: As others have said, if you need to order a new tank, you can order one with the ECS setup (for the tubes) or without it. Notice the pic that Dave posted - If you use the ECS setup (with that pipe), you have to allow room for it in the trunk, and route those rubber tubes. My '70 was originally a Cali car, so it had ECS. I took one look at that nasty mess of tubes, and ditched it in favor of a setup without ECS!
-Tom