Buggy mirrors! Finish off that cage or half door with a couple of these! 3/4" tube with a 5 3/4" convex mirror. The mirror is mounted on a stud to allow you to adjust the mirror to your liking. I have used a mirror that has an off set stud to allow you to move the mirror more then a standard center mounted stud.
Can add a piece of half tube to allow you to clamp mirrors on for $5 as well.
Half Tube ID