This part is listed by BMW as BMW part number 32211113178 (32-21-1-113-178) and is described as Genuine BMW M8 Hex Bolt for Steering Pitman Arm on E10 1602, 2002, 2002tii (1967-1976).
BMW Fitments:
2 Series
Vintage 2002 (67-76) > E10 2002 (1969-1976)
Vintage 2002 (67-76) > E10 2002tii (1972-1974)