Got it! The OA code must be Optional Axle since Fisher would need to install the positraction emblem on the dash. Wish somebody had a pic of the trunk lid or engine to verify the LA code.Here's the other photos of the car when I recorded them. I don't think it was a level air car, but it does have positraction, and maybe the LA code means that the body was to be shipped to LA for final assembly? Can you see any obvious options that OA might stand for?