I think they are called splash guards. I have been looking at a lot of Gen12 trucks, watching old videos of them new. Some have this paper/rubber material to the left and right of the radiator, bumper to the radiator, and over the strut towers. Others never had it.

I notice the engine bay gets pretty dirty with crap, especially in places that salt the roads.

Was this a standard thing always, added later models, or something else.

If it was not always standard, are they worth adding back in?

Thank you.

 

Around the radiator:
https://www.f150forum.com/f38/under-...ur-own-426386/

I used a rubber mat from Home Depot:
https://www.f150forum.com/f78/lamina...6/#post7080096

For the wheel wells, I eyeballed it and cut them to fit:

 

The "paper/rubber material to the left and right of the radiator, bumper to the radiator" are air deflectors. And, Yes they are "worth adding back in". *Direct air to the radiator.

The F-150s with an EcoBoost engine have aprons attached to the inner wheel well liners all others do not. *Their omission will increase "the engine bay gets pretty dirty with crap, especially in places that salt the roads."

Some references...
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Osumet’s templates work! If you are also missing the Christmas tree fasteners get a box of them too.

These are mine


Patterns laid out

Air dams ready to install

 

Thanks all very helpful, and that explains why I see them on some and not others. I have a 5L and no sign of them on the struts, so makes sense now

 

Yup, pretty big gaping hole through to the engine on both sides without them, they're custom, links given above, worth doing in my opinion.

The other stuff, definitely replace if it's missing or torn, it does affect cooling and the factory material is crap.

 

All the trucks should have the air deflectors around the radiator. As above, only the EB's had the extra wheel well shield. I added some like Laminar showed and have had almost 7 years of a clean engine bay. In Minnesota. It is a little dusty, now. I need to do some cleaning in there.