If converting from sear zone burner to U-burner then these 3 parts are needed:
U-burner
U-burner door/cover – S26345 (not necessary on the B series grill)
Flash Tube – S21750WY
w/ Nut x1 S14105, 1/4 -20 Serr, Hex, Flange, S/S
Parts List U-5 Burner
WARNING
Each, sold separately.