Curtain Rod Mount from (The $2 Curtain Rod System - IKEA STYLE)

an 80 mm long version of the "The $2 Curtain Rod System - IKEA STYLE" RIGHT_SIDE_-_LARGE Which actually doesn't exist on his download page.

This version is extended from the wall a few more millimeters since my existing side hangers are about 80 millimeters from the wall.
I also expanded the hook in diameter a bit, to fit my rod.

I am using this as a middle rod support, but you can use it on both ends if you flip it in your favorite 3D editing program.

***UPDATE: I added the left side