Mirrors for a '78 KZ750?

I am very new to motorcycles in general, so this may seem like a noob question. How the heck do I put mirrors on my motorcycle? I had a friend tell me I could mount them on the handlebars but I have no idea where they would screw in.
Here is a video of my bike, during which there is a glimpse of the fork/handlebars. Anyone know how I can put mirrors on this badboy?

The KZ clutch perch & Fr Br mc each should have a mirror orifice (10mm). Either someone has plugged the holes or non-stock stuff has been installed.