The replacement floor I have has the holes and cage nuts welded in as purchased. The cage nut floats in the box cage. I don't believe the replacement floor sections that you buy individually have this welded to them unless you buy the complete floor. The cage nut gets covered by the seat pans after it's all put together.

I don't know how you are going to add it without major repair. The seat pans do not come out without a fight. Welded in like an armored car...

I happen to have my old floor sections which have the cage nuts, that could possibly be cut out and patched into your floor but not till I am finished with my floor. I need them for any reference points while I put in the new floor. Still would be a big issue to put these in and properly locate.

it's unbelievable to me that someone would not put the nuts back in if they were doing floor work and took them out....