Thanks for writing. Yes they are one year only and there were actually two different headlights door styles for 73 full size models. Centurion and LeSabre headlight doors were different from Electra and Estate Wagon headlight doors. The difference is the lower section below the headlight openings. There are more vertical chrome lines on the Centurion/LeSabre units than on the Electra/Estate Wagon units. This was done to match up with the adjacent grilles. See photos below. I had the part numbers already but thank you for sending them to me. Regards, Glen