Hello together. I’m new on the forum and I already have a first concern. I have a W126 420SE BJ. 87. The seller had given us a KAT. Unfortunately, the number on the cat is not quite readable anymore. Is there a way to find out this? In the old vehicle letter it says: After installation of the following equipment, vehicle is considered as a low pollutant according to Appendix XXIII: 1. Catalysts, No.Kt 0005 U.Kt 0004, 2. Lambda probe, No.OS 0002, 3. Fuel filling tube M.Re It may have a jmd. this plant or can help me a little bit. Thank you very much.