This does not come with the factory noise isolator bushing. Most will bolt it in directly, or you can also install one of our shifter gasket isolator kits at the link below depending on what transmission you have. This also eliminates the need for silicone to seal the shifter to the transmission. https://lmr.com/products/Mustang-Shifter-Hardware-And-Accessories
For hardware, you can simply reuse the existing hardware, or we also have shifter bolts in the link I posted above.