Yes, I think they are! Several years ago, someone pried the lenses off the taillights on his 1995 Mustang
and we learned that the lenses were part of the entire tail light "bucket". I gave him the money for the new parts and he installed them, I don't recall whether he was able to find just the lenses or had to buy the "buckets". He is out of state right now and cannot be reached. Maybe by now, just the lenses can be purchased and glued on!