oval flange

Trying to sell my home and doing some DIY for a toilet my wife noticed was leaking. When I pulled it up, I noticed the wax ring was deformed on the left side. Whoever put in this flange unit jerry-rigged the left side to hold a bolt using a galvanized steel pipe hangar strap with a bolt run...

I removed an old toilet with 12 inch rough in to replace it with a newer design. To my surprise, the closet flange was oval rather than round. I believe it is a Proplus 94848. (See attached photo.) Apparently it was used because the rough in was only about 11 inches. What is the best way to...