Answer Joe, For the conversion to Natural gas you would need to loosen the orifices on the bake and broil about 1 1/2 to 2 turns and close the air shutter on the burner to about 1/4 way open. Flip the regulator cap from LP to Natural. For the top burners you need to get the burner tubes which will have the orifices on them. The part numbers needed are Right rear WB28K10187, left rear WB28K10188, right front WB28K10189 and left front WB28K10217. Read More... Answered by AppliancePartsPros.com | Friday, November 6, 2015