Your bike should have plugs in these holes (2 on the right side). The part number is 90329-98 ($1.50 ea). No doubt you can find them for less at a hardware store but you'll know the ones from the dealer will fit. The dealer won't be too thrilled to order them as they have to buy 10 at a time and hardly ever sell them - BUT, that's their problem, not your's.

 

Passenger floor boards or pegs is what is on my 09

 

Don't recall ever seeing anything mounted there. Maybe it's an anchor point for the frame fixture when the frame is manufactured?

 

I was waiting for this one.

 

Clean the area first

 

As some have mentioned, you should have black plastic plugs in those holes.
I have a 2011 FlHX also, and have the same holes (with black plastic plugs).

 

This picture is from my 2011 flhx.

 

I got it I got it. Side car mount?

 

I have black plugs in my 09 SG as well. Wouldn't have thought about the holes til I saw your photo.

 

Mine had a bolt in each hole. I just used one to mount my inspection sticker plate.