This is a 22" channel balance. It is 9/16" thick, so that falls under the 1/2" channel and 22" long. I had more than 5 pictures but am only allowed 5. Let me know if you need more and how to send them. I followed your online guide and came to product code S351-22 The only marking on the channel was the number 2140 and there is a picture of that.
Brett