The spoiler can be screw down or glued (or both).
Screw down version: it is recommended to use the original elements included in the package. Drill the holes and fix the spoiler by the screws which are provided.
Glued version: it is recommended to use the BETALINK glue or possibly the other one used for spoiler assembling or similar fixing.
We recommend assembly by an expert.
Roof Spoiler
Vectra C Estate