I have a 1970 that you can see pictures of through all sorts of states - there is a couple of photos with the seats out, but i don't know if they will be of much help to you - the hardware is not in the pictures as well.
http://tinyurl.com/9ssum shows the floor pan replacement/repair on my 1971. There are lots of pics of the inside without seats or floors or cargo area or wheel wells... Sounds like your truck is like mine?
We just rebuilt a 1972 tub, If you check out the link in my sig line and go to Jason's. You'll have to scroll down most of the way. This is the one that rolled and we rebuilt it with a different tub. Ther are a lot of pics, probably 300, go to the bottom after the roll of the green one.