Street Coilover Kit (Gold) - Weld-In for Opel ASTRA F Convertible (T92)Street Coilover Kit (Gold) Weld In for Opel ASTRA F Convertible (T92). The installation requires the use of OE front struts they should be cut and welded as described in the included manual The Street series suspension is the default configuration of MTS Technik engineers, it guarantees a wide range of lowering and a balance between comfort and stiffness. Suitable for the following engine(s) only: 1. 4 Si 1. 4 i 16V 1. 6 i 1. 8 i 16V 2. 0 i MTS