[field]

2 seats in the front, and 2 small torture chambers in the rear suitable only for very small passengers or a VERY short drive.

 

[rashane]

Fast backs in those days usually did not have rear seats.So the Mustang fastback had two rear seats that folded in the rear to accomadate passengers althought they were not much

 

[Kilian]

stands for 2 seats or 4 and the back seat backs fold down

 

[wicleah26]

It means it seats two in the front. Now if you have small and/or understanding friends, it can fit two in the back as well, but it's not something you want to do on a regular basis.

 

[Marx]

2+2 = 4 seats.