Don't know if it's the same on a bench seat car, but on my buckets there was more than one set of holes for bolting the seat to the brackets. The seat could be moved back a noticeable amount just by using the other set of holes. In my car I could drive with my seat all of the way back, but in my mother's nearly identical car I had to move the seat forward some because her seat was mounted farther back.
I was young & stupid & it was a long time before I figured out why there was a difference. Now I'm just old & stupid. :angry7: