Sure Heat 2008 Four Seasons FSIS Natural Gas Conversion Kit - Manual (Page 6)

20. Remove the two (2) screws securing the bottom IR
burner in position on the front. (See Fig. 20)
21. Remove the rear one screw securing the bottom IR
burner in position. (See Fig. 21)
23. Hold the elbow on the bottom IR burner, then use the
supplied wrench to remove the LP orifice. Replace it
with the supplied NG orifice and secure it. (See Fig. 23)
24. Place the bottom IR burner back in to the grill, reattach
the flex line and igniter wire, then set it back in position.
(See Fig. 24)
Fig. 21
Fig. 22
Fig. 23
Fig. 24
Igniter wire
Fig. 20
FSISLP Natural Gas Conversion Instructions
22. Pull the bottom IR burner out a little and disconnect the
flex line and igniter wire . (See Fig. 22)
Note: Make sure the igniter wire dose not fall into the
grill.
Flex line
Elbow
Orifice