This is stated in the product description. There is a link to the Thule website: http://www.thule.com/fitguide....) This allowed me to find the answer for my model and to check if I needed an adapter kit as well... :)

I had a Jeep and don't know if it fits your Opel. Ask Thule directly. Good luck!

See Thule.com Buying Guide Tailgate Carrier Backpack 2