THere are studs mounted to the bottom of the tracks. You unbolt it from underneath the car, There are 4 rubber plugs under each seat where you can access the nuts.
Just be carefull that you dont lose the nuts inside the seat riser, they can be pretty hard to find
I removed the four nuts easy enough, but working in a one car garage, I quickly found out that I couldn't get them out of the car! Oh, yeah, Historic is correct. Make sure you update your "car maintenance" vocabulary, it came in handy.