the Dynacorn parts are good quality, but if you really need that much of the floor you might consider looking for a better cab, it won't be a matter of "dropping in" the replacement, you're looking at rebuilding the cab on top the new floor
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics