I went to a dollar store and bought a piece of plastic channel about 2 feet long. I cut it into 4" sections. It is the same thing Al has except mine is yellow. It is like a "C" channel except one side is 1-1/4 inches tall and the other is about 1/2" tall.
I like the looks of the wire one better than mine though. But I was able to make about 8 of them for a dollar. I gave the extra one's to Pat in Bay City. He may still have one. They are free. Especially for you.