I have given up on junkyards in southern AZ for any square body parts - all stripped already or complete trash. I would suggest online search, like this one:
http://www.car-stuff.com/store/?N=98...588+11921+9204
I would call the supplier and ask questions before your buy.
Probably Chinese parts, but it seems like everything is now.
You could also call local radiator shops to see if they have a supplier for radiator parts. People often mod their RV haulers or commercial trucks with larger radiators and need different shrouds and plates.