66 Barracuda front seats

I thought the 66 Barracuda front seats came with the hard plastic cover for the seatback the same as the 66 Dart GT. In looking over the 66 I got home last night, I see that the seat resembles the 65 with the upholstered back cover (although the upholstery pattern is for a 66). The Legendary catalogue doesn't mention a seat back panel for the 66s. Anyone have any thoughts on this?