You will almost certainly need to increase the orifice diameter when converting from LP to NG. On this page, we'll show you how to remove/replace the orifices for the three main burners, one side burner, and one back burner. I'll show pictures of how to do it in that order with comments below.
You should have some idea of "about" the right size to drill out. Be sure to read the notes about this in the LP-NG Conversion Web Page. Notice I said "about" above ... NG has different "heat/burn BTU's", different pressure, and probably other things I'm not even aware of. In my opinion, you want the grill to operate at the same BTU's as before and/or provide the same amount of heat/temperature as before. Again, read the notes in LP-NG Conversion Web Page that talks about this "tuning/tweeking" process.
To state the obvious, it is much easier to drill a hole larger - much more work to make it smaller ... so work your way up to the "right" size.
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View from the frontside - note 5 screws/nuts
View from the backside - remove 'em and take off the cover
Here's the gas line, orifice, and burner
Spin gas line flare fitting off
Using wrenches, needle nose pliers, fingers, etc., spin the retaining nut off and the back burner orifice will come right off. I just left the nut in the burner as this made re-attached easier. Drill it out and reverse above procedure. Flare fitting should not require doping.
Always a good idea to leak-test