Ok so this is the outside of the passenger seat it has a lever you pull in back and hinged mounts in the front.
When you pull the lever it releases from the floor plate, the inside rear of the seat just rests on the floor, essentially the seat mounts in 3 points.
Then here are my new 1999 Sierra extended cab seats note the rear lever this is the easy entry option. Here is the seat all the way back
And here is the seat for rear entry
