The public often criticized that the wheel spacers are not good for car. But the topic and the reality often has a contradiction many people choose to install the wheel spacers and it did work. The reason why have a accidence is the quality of the product is not reliable. I have install the wheel spacers in panamera. 7mm Spacers in the front of my panamera and 15mm Spacers on the rear. In addition to the right spacers, we look at using the proper length wheel bolts when installing spacers. The bolt length is 30mm and it is fit for this spacers. The hub-centric length is 71.6mm.