Not sure what to call them, but they are the rubber flaps that cover the gap between the inner fender and the frame to keep out water / debris. I need a new set, mine were totally dried up and cracked, two completely fell out. Was going to just grab some flat rubber and cut matching pieces out, but does anyone sell these anymore?

 

That would be great to find some bc I need them too, for a 1979 4x4

 

at the shop i work at we have done a few body lifts on trucks and the kit always comes with these pieces. they are called gap guards i might have a set so if you need them pm me.

 

this might help Toyota 4Runner and Pickup: Waterproofing Tricks