Dadbum Drapery Brackets

I’m trying to source these metal brackets used to attach drapery holders to the wall.

The brackets are sold by many people under many different names, including  http://www.blindsparts.com/kirsch-wood-trends-bracket-5611bb073/. But I can’t find anyone that sells just the metal bracket.

Here’s a video on how to install it. Check out @1:10

https://www.youtube.com/watch?v=KOpSUghfZdg

Here’s a vendor that sells the rod holder