I made my own. Sorry no better pic on my IPad this weekend. This is Hana, our DIB. (Dog In Back)
I have a few extra of the curved ones in my hangar I will share by snail-mail, no charge! Once you see it you can make the round convex one yourself. I will include an extra bar mount, you supply just the round mirror, if you want. Once you see the simple construction you could make four or five to fill the entire roll bar. Just need address.