Seller was contacted. It was also a quick answer.
Although the mail in google was German (underneath the English text was) the withdrawal was completed without difficulty.
Caution: If you are used to the fast unwinding on Amazon so the settlement on the seller (10 days) seems very long.
But everything works flawlessly! The Porto was also refunded.
Conclusion: Even if it did not fit with us. With friends the bulbs fit properly and the rescission was super.
Hence from me 5 stars!