Thank you for reading my post. I'm trying to repair the tub and came across these spacers (or mounts) on the underside, pinned into place to the large square tubing that runs side to side under the floor panel between the rear fenders. There are two of them and appear to be made of densely woven cotton/twill resembling a webbing. I'm trying to replace them (or fabricate if unavailable). Does anyone know what they are or how I can replace them?