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I didn't remember seeing these in the display at lowes and I have almost completed putting mine together. I have two machine cut holes in the bottom of my SB that is on the opposite side from the SFB. Any ideas what these are for?
I am not near my Chargriller right now, but if I recall correctly those are for a wire hook to hang a drip can to collect grease from the belly of your smoker.
If you plug them you'll have a grease pool in the bottom of your cooking chamber. And without the grease cup and with unplugged holes the grease will be on the ground.
here's a link to the cup holder Grease can cup holder.