After selling and using the other available aftermarket bushings on our own 356's, we noticed that they're too soft and larger than the original ones. So we manufactured the correct bushing and created this new kit. This kit with OE quality bushings will take a little bit longer to install but it's worth the extra work! When installed, your sway-bay will not only work properly, but it will also give you a much better handling on your 356! This kit includes six bushings #644.41.602, two bolts #900.074.063.02, two washers #900.027.016.03 and two nuts #N.101.552.10. They measure 11mm in diameter. It's recommended to use silicon GREASE when installing. Professional installation recommended. ** See P/N#SMC.41.602 for 15mm bushings