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.

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