Early Mustang seats set lower since they are thinner and don't have the higher tracks like the falcon. But if you have the falcon tracks they can be adapted easy enough. The mustang tracks are longer than falcon. Otherwise you will have to fab' riser blocks to get them up where you are comfortable with them.I tried some 66 mustang ones in my 64 futura and they sat to low for me. It may be the difference is in the track , There are some falcon ones on EBAY now at allmost $400.00 the last time I looked. They were good looking red ones.Going to high for me as I would have to change the color to blue.