On the stone defector are you talking about the plastic part under the bumper? If you are i have heard of people using late 80s ford ranger ones believe that they are 1 or 2ins sorter but will still work. Most people call them air dams  might do a search on here to get specs.
As for the grill just have to try and find NOS or a good used one. Ive been wanting to try and see if a newer ford car grill could be modded to fit. But would take a lot of fabrication. Picture  of a 2015 ford police grill.
There are several grills listed on Ebay. Hope this is helpful.

Sent from my SM-G965U using Tapatalk

there is on listed on e-bay. the only problem i see with it is, that the two center mounting tabs are
broken. and that he has it listed as a 74-75 grille. listing number 313753394906.  good luck

The broken tab could be fixed with another piece of similar plastic and plastic welding on and hole drilled to fit. Plenty of YouTube videos on how to

Sent from my SM-G965U using Tapatalk

also noticed that he's not too far (about 45mins.) from me. but i don't need another grille.