If I remember right, of the four threaded studs on the seat rails that came on the seats, only one will line up with the oem holes in the floorboard.
I think what I did was (on driver seat) use the foward right side threaded stud, toward the consol, and let that one fall in the oem hole in the floor raised rail, then I pushed downward HARD as I kinda used the other three threaded studs to scratch the paint off where they needed the new three holes drilled....
Once I removed the seat back out of the car, I drill three new holes, then put her back in the new holes, plus the one already drilled from the factory seats, and moved on to the other seat....
It was really too easy for me....
If you use the left foward oem hole (on driver seat) in the begining, it may put them to close to the door jam to shut. Thats how it looked to me, but I didn't try them that way... who knows, they may fit that way also.
As far as adjustabilty, mine go all the way back, and close enough to the front where I think you will be ok with my way I chose to install them.
good luck to ya...
joel