Welcome to Dr. Björn's Auto!
This is a new quality headlight switch for T3 Vanagon. It is actually good to have a spare as it can create dark moments when it fails.
We have all options: There are three models which look the same from the front. "M" is the most common one and "L" has an extra connector for running lights. Look at the comparison picture. The late series of Vanagons "T" can have one more connector adjacent to the two wide ones (see image).
Part Numbers: 251941531M, 251941531L, 251941531T