The anchor points in my 2004 are sunk into the floor, and then there's a bar bolted into that area that the seat attaches to.
What brodg is talking about means you'd probably have to cut holes in your floor and have junkyard parts welded into place. The part would be cut from an existing Hoe and welded into your truck's floor. The parts would have to be welded into the exact position if they were put in separately, or the seats would be a pain to latch in. Seems to me if holes are going to be cut and welding is to be done, you'd be better off replacing the entire cargo floor with one that had the brackets. Take into consideration that if you were in a wreck, and someone was belted into that seat.. you'd want it to be pretty friggin sturdy.
I don't know what the hell I'm talking about really, I'm just guessing.
Trying to help ya troubleshoot.
Long day.
BH