I know it's been a while since someone commented in this thread, but I installed a sunroof in my truck, and it is similar to the one in the manual that RobbieD is showing. It came from a first gen Explorer, and it has the round crank handle. If it's anything like mine, you have to crank up the glass all the way, and there are two red tabs that you push in to unlock the back from the piston that pushes it up (see first image below).
There is just a hook system on the front, so all you have to do once the back is free is lift the glass close to vertical and lift out of the attachments at the front (see second image below). Those bars you see hook into grooves on little bump outs on the frame. I believe there were actually a couple types of these connections, so this may not be exactly what yours look like.
Also, this is just some spare glass that I had, so easier to take pictures of that than the installed glass. If I get some time, I can try to take some pictures of how this all works on the installed sunroof.
I usually try to go to Bronco Graveyard or LMC Truck for odd parts, but I didn't find the sunroof rubber on either of those sites. I could have just been searching badly, though.