That's where it goes alright, but I see something that you're going to have to change. Your regulator is the old style quick connect, you will need to change that to the new style that fits the OPD type tanks.
You can't buy or get the old style tanks refilled it's illegal. Weber has what you need a new regulator with the hose for a little over $20.
As far as your model the owner or the store where it was sold added the side burner, not an uncommon thing. Even my 1000LX had the opening plugged so the manifolds are the same all they had to do was unscrew the plug and add the hose.
Post some pics when you get it done.
. There are a few posts of people connecting side burners to genesis models that did not originally have it. I sent them private messages hoping they would be able to point me in the right direction towards getting it hooked up. I'll let you know if and when I hear back from them. Weber's 800 number wasn't able to give me much information on my grill, and their website doesn't recognize the L3 starting serials that we both have. I did manage to find this video where they described hooking in a generic replacement line and then using a dual line regulator. I'm going to save this as a last resort if I can't find a simpler solution but it might be worth taking a look at in your situation. My grill has a square black plug where the side burner is supposed to be attached. I'm not sure where the valve attachment is, or if there ever was one with the grill. Good luck. Let me know how you make out as I may need to go your route as well.
