5 x PEEK Hex Socket Head Screw M4 x 20mm Nuts & Bolts - Peek Plastic Nuts and Bolts, Anti Corrosion, Chemical Resistant, high Temperature Resistance, Non-Expanding : Amazon.co.uk: Automotive
White Nylon Wing Bolts and Nut Set M4 x 20mm
M4 Nylon Plastic Bolts and Nuts and Nylon Flat Washers Packs of 6, 12 ,24 | eBay