I wrote a write up in what I think is the appropriate section on my install. I searched the site and there was nothing on on how to remove rear seat for 2007s and below F150s. The 2008s and later models have the leaver but earlier years did not. It is not easy to take that seat out. Perhaps it will help if not oh well I gave it a shot. Here is the write up. (Please forgive the grammar...I wrote it up after I completed the install, which drained all my energy.)
https://www.f150forum.com/f7/2002-20...nstall-126600/