actually this post doors may be EASIER to find since they're also used on two door valiants.
i'm pretty sure that the door skin dimensions are the same with the two doors, its the internals that would be changed. if my 70 dodge truck is an example of how ma mopar did things back then, those internal assemblies should be removable, or swapable. check for any fasteners on door edges.
the hardtops wing assembly should just unbolt and lift out, in theory, the sedan window frame should do the same,...and if i find different when i check my cars in awhile i'll write back and correct myself.