The same seat frame is used for both regular and deluxe interiors, it was the seat foam that was different. The 1967 seat frame was very similar to the 64 thru 66 except for the way the upper seat section outside trim was installed, different hole placement. There are differences in 64, 65 and 66 upper seat section inside trim holes too. There may be running changes and differences in different suppliers frames as well.
Jim