2011 Tacoma Access Cab - need help putting it back together

So I have had my 2011 Tacoma since new. I removed the jump seats etc at the same time.

Now I am selling the truck and need to get it back together. All went fine except for the two middle seat belt anchors. I see two small bolts I must have kept in place in the back center of the truck. There are also two bigger bolts that are in the same area - they are snugged up.

From what I see it seems like the two smaller bolts are too small for the seat belt anchor. The two bigger bolts (one is rusty and lost a corner) seem like they are too big to fit into the seat belt. The bigger bolts will turn but I could see them giving me a problem.

So how/where do the seat belts get anchored?

Also, what else is missing that should be covering where the metal floor is exposed?

Thanks,

Jim

 

I posted the picture below....