Lucas pattern (replica) brake switch (stop light), plastic button. Came originally on 1967-83 Norton, Triumph & BSA Singles, Twins & Triples. Original part numbers: 34815 - Lucas brake switch 34815; 0634815 - brake switch (Norton) 95-1028; 99-1028; 01-031621; 96-190916; Triumph 46-42560;