Wouter, Thanks! Yours is the 81st convertible with standard interior built. I don't have a convertible dlx interior car close to your VIN, but they were well into the 100's for body #'s by then.
This is where the differences in how Camaros vs Firebirds were optioned are really noticable. Most Camaros are base interior. Most Firebirds are deluxe interior.