All the extended bags I see look like they are for 2-2 systems, are there any extended bags that don't have a cut out on the left but have one on the right for a single exhaust?

How's it look? What did you do?

 

Yes, these are the 3 1/2" stretched Top Shop new style. Extremely well buildt and reasonably priced.

 

There's lots of options. Baddad, native customs, and Topshop. Those are the most popular. Do a search you'll see

 

Not sure what exhaust you're running, but a ghost pipe is always an option.

 

Most all vendors offer 1 cut-out or no cut-outs. Mine have no cut-outs with pipes turned down under the bags.

 

I put extended bags on my RoadKing with a 2-1 pipe but wasn't too concerned about the space on the left side because there is still a space even if you go with the full bag on the left side.
I just made a quick bracket out of thin aluminum and painted it black and attached my State Inspection sticker there.
Just another option for "a filler".
Sorry for the pics, it's already dark out and I'm no photographer!

 

Yes top shop is the way to go. Native custom bagger has top shop in stock maybe cheaper buying direct.