You will find the 4-digit HSN (manufacturer's key number) either in your vehicle registration document under position "2.1" in line B, or under position "zu 2" in vehicle registration documents issued up to 30.09.2005.

The TSN (type code number) is a 6- to 9-digit code that indicates the vehicle type as well as its variant and version (VVS). You will find it in your vehicle registration document under position "2.2" in line B, or under position "zu 3" in vehicle registration documents issued until 30.09.2005.