Legal question V70 Order

Hello municipality, I ordered a V70 D5. At the time of the order there were 215/55 16-wheels in the equipment package. I received the order confirmation on September 09. On September 18 the equipment package was changed and now there are only 205/55 16-wheels in the package. My question: What rights do I have, as they are reserved for technical changes. Can you give me concrete arguments? Thanks already now