Hello everyone. Newbie here. What I did on my '80 sedan, about ten years ago, was install some taillights from a '65 T-bird. They are the exact same taillights that are found on the '68-'70 Shelby Mustangs. I wired them up so the turn signals flash sequentially, just like the old T-birds.
They are getting hard to find in the junkyards, but they can be had at some businesses that cater to T-birds or Shelby Mustangs.