OK, if I release the seatback, there is some spring action that pushes the seat forward. There is no lock - never has been (at least since I've owned it). Driver's seat is not supposed to slide forward when the seatback is released. It sounds like someone replaced your driver's seat with a passenger seat (they are pretty much the same except for one small cable that releases the slide mechanism).
Seat sliders are a pair of brackets that Tone designed. They bolt between the seat mounts and the floor. They just move the front seat forward about three inches to allow more access to the rear seat.
I've got one more set on hand for $75 shipped. PM me if interested.
[SIGPIC][/SIGPIC]
Put a smiley after you say that Bub.