I just misunderstood the situation. It looked like a picture you took of your boat and was just confused since there is one already present in the picture. Gorgeous boat by the way.
I would try contacting your local BRP dealer. I actually had the rear supporting pole of my bimini shear in half due to the OEM connected stern light being designed terribly and weakening the pole there, on already a thin diameter tube. I've been trying to find an entire bimini top for mine and even contacted my local BRP dealer that has been working on my boat. They told me even they were unable to order me one as they have been discontinued and aren't made anymore.
With that, I am going to a local shop that can supposedly fix/improve my current bimini top. If that doesn't work, my other option, which is what you may need to do, is go to a local shop that can create a custom bimini for your boat.