I am trying to locate what I have heard referred to is tubing donuts. I am looking for 1.25 od, 1.375 od, and 1.5 od thin walled tubing that is bent all away around in a donut, so you can chop it up and have pre-bent radiussed pieces to weld to. Even U-shaped would be okay. Appreciate any help. Ive seen it, so I know it exists, just cant remember where I saw it.