You might also be interested in these copper exhaust nut.
XinYuan Hex Nut 12X M8 Copper Flashed Exhaust Manifold 8mm Nut -High Temperature Nut Compatible with BMW Tuercas De Cobre Le Cuivre Des Noix Nuts
MATERIAL - Zinc-plated carbon steel locknuts are a good option in dry environments, they are also corrosion resistant in wet environments. Suitable for fastening most machinery and equipment.
£ 10.63
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15 Piece Exhaust Nuts M8 Hexagonal Copper with Stud Bolts and Screws for BMW E30 - High Quality Set for Optimal Performance
Comprehensive set: includes 15 exhaust nuts M8, stud bolts and copper screws, perfectly matched.
Hexagon nut with a thread to prevent loosening, nylon insert prevents loosening and holds nut firm during vibration. These threaded inserts are water-proof, rust-resistant, and sturdy.
12 Pack M8 Copper Plated Exhaust Manifold Hex Nuts for BMW E30 3 Series | 12 pack M8 copper plated carbon steel self-locking hex nuts, compatible with BMW E30 3 Series for exhaust manifold repair
PureSphere
£ 6.29
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Car Exhaust Manifold Nuts, 12Pcs M8 Copper Hex Nuts Self-Locking High Temperature Automotive Parts, Compatible with BMW E30 3 Series
