Just because a car is located in California does NOT necessarily mean it is a California model. Because of California's often extreme laws, many dealerships just over the border make a lot of extra sales from people driving over the border to buy a 49 state legal model and then register it in CA.
As well, California keeps changing their emissions laws to be more restrictive than the rest of the county, but soon the rest of the country catches up. So, since 1976, you will find manufacturer's made "California Only" models, then stop making them for "50 State" models, then start making them again, and on and on...... Depends if the Federal and California laws corresponded those model years or if California passed another round of even more restrictive emissions laws, that the Fed would catch up to in a couple of years.
I don't know, and I could be wrong, but I don't think there were any "California Only" models for Commanders, the emissions laws were such during those years, that California Only models weren't needed, the vehicles for the rest of the country met their emission standards. You should do a little research, cause I am NOT confident at all about there NOT being any California Model Only Commanders.
Yes, California also has very restrictive aftermarket laws as well, laws like anything effecting emissions must be repaired by state approved professional mechanics, and only use Dealer/OEM source replacement parts, etc.... That also gets into the mix when discussing resale of California vehicle, when it really doesn't apply. Its just a total pain if you want to repair your vehicle yourself.