Brake switch, Lucas pattern 34815,

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;