NPD sells a chrome kit for a '65/'66 fold down seats and it says "can be adapted to '67/'68 by cutting one notch out". Is there a difference between the '67/'68 fold down and the '69/'70 one? I know all the side panels are different, but kind of think that there's really no difference in either the trap door, the false floor, or the 2 panels that make the seat back. Is this true? If so, it seems that chrome kit would also work for a '69/'70.