Here’s what you need to replace your mirrors with Duke II mirrors:
Right side Duke mirror: 58712041000
Left side Duke mirror: 58712040000
Mirror supports: 58412040050
Right side brake clamp mount: 58302044000
That last one is important as it moves the mirror inboard to the front brake clamp instead of two inches out on the master cylinder reservoir where it’s very easy to break.
Here’s a shot that shows the parts on the bike: