Seat wont' slide back all the way

[Michael7810]

Has anyone had this problem before?? Both seats hit a hard stop before going all the way back. I'm 5'-10" and it barely goes back far enough for me to drive. I have another pair of seats that do slide all the way back. The car is a 1972 and the seats are from a later model that have a wire sticking out of the bottom, but fit the rails just fine. I removed the seat rails and the rails by themselves slide back all the way...when I bolted them on the seat it stops ~ 2/3 way back.
Thanks for any help you can provide.

[etcmss]

are they stuck when lifting lever to retract?
had this problem and the lever in the rail is not up high enough to slide----with a flashlight look at the left side rail and stick a screwdriver in to release the arm---a little bit of gap and the pin will clear to slide back. mine would stick this way and this released it to go back to drive position.