Hollow sealing sought in the Hamburg area

Hello to the round Maybe this would also be a question for carross series care, but I’ll start here. I recently bought an E46 convertible, which I now want to give a cavity seal. The condition is exceptionally good, and an unbasked 6 cylinder is not so easy to find. Does anyone have an idea where to turn in the greater Hamburg area? Experienced…Prices… Thank you…