How do I get these seats out? '77 w123

[hos280]

well i have my pool noodles, I have polyester filling and new seat springs.
I would like to rebuild my front seats, but I can't get them out.

I have read the w123 manuals and the haynes manual, which state the exact same thing.

There must be a trick. how do you get the "slide rail" out and what is the difference between a "slide rail" and a "guide rail".

I remove the philips head screw in the rear, inside the slide rail, but nothing is budging. the very bottom back screw that holds the frame in the rear, has a non hex nut (it looks like a thread sleeve welded to the seat frame). you have to unscrew that from the bottom.

The instructions say "remove slide rail screw in rear and remove slide rail"

can anybody help me?

any help is appreciated.

hoss