The first three pictures are of the complete assembly (part # 17-066142 for Pre-focus or part # 17-066142/H for Halogen) and the last picture is of the shell only (part # 17-066142/S).

Current prices are:
17-066142 $195.81, 17-066142/H $238.18, and 17-066142/S $85.69.

This assembly only has three wiring holes. This is the assembly found on the 1975 MK3 850cc Norton Commandos.