Split Pin/Cotter Pin-Front Wheel Hub- 1600/2002/2002tii, 320i (77-83), Bavaria/CS, E12/E23/E24) (Wurth-made in Germany) - these measure 4x45mm. Silver zinc finish.
Comparison photo between the 3.5x39 genuine BMW pins and the less expensive 4x45mm German aftermarket pins. Both work for this application.