When we did our aftermarket armor (land cruiser) we had to put a piece of square tubing with holes drilled (big on top, small on bottom) for the old mounting locations and reversed holes for the seat rails (to get a nut inside the tube. Problem is that you will be raising the seat the thickness of the tube. We did it that way as it was faster (did 7 taliwagons) you may want to just add a stiffening plate and weld the nuts to it using a good stiff pattern material.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course