This is the heat shield cover for the U-burner. Photo shows the screw installed and the screw for size to the right.
If moving from a sear zone burner to a U-burner this part is needed to cover up the hole.
For use with Screw 14144, 10-32 x 1/2, PH, Truss, MS, S/S. This can be purchased in a 5 pack p/n 4490030294.
Each, sold separately.