I put a set of these on my Ultra but they can be had for a Dyna too.

Part numbers were 91910-03A and 91909-03A. $28.25 each from
M&M Cycles. Like you, I'm a wide body. They moved the mirrors out about 1" on each side. I was hoping for a little more, but they were still a big help.
One tip if you haven't already tried this. Sight across the bars and make sure the stems of your mirrors are lined up across the bars. Often the dealer will angle them with the bars, but lining them up will give you the widest possible view.