Rust repair solutions: https://mercedessource.com/store/search?keys=rust%20repair.
Best rust repair product for your Mercedes and other old car. Stop the rust early before it can grow into holes. Sealing the rust from any exposure to moisture it the key to success. Normal paints, undercoating, conversion coatings, primers and sealers will NOT do that.
Hex High Tensile Bolt SAE J429 Grade8, Material: 40Cr, From Ningbo S&D Metalwork Co.,Ltd, www.sendingmetalwork.com