firstgen sheetmetal interchanges

[Sadist]

Hey gang...
i see front floor patch panels for pickups, but none that are blazer/jimmy specific, are the front portions interchangeable (i assume they are)?
I also see radiator supports listed for blazers, but not for the jimmy... will i knead to modify the heck out of a blazer one to work with a jimmy?
and lastly, my rear floor section is pretty (merle) haggard, these are readilly available for 73 and newer rigs... has anyone modified one to work with a 72and prior?..

thanks!