Using these Perrin wheel spacers is a breeze. First, make sure your vehicle is a 2005 - 2021 Subaru STI or 2015 - 2025 Subaru WRX. If you're using aftermarket wheels, check that they have pockets 0.078' deep between the stud holes on the wheel mounting face. OEM 5 - spoke STI wheels won't work. Installation should take around 30 minutes. Just follow the included installation instructions. As for maintenance, regularly check the bolts for tightness. If you notice any looseness, tighten them carefully. This will help keep your wheels and spacers in good condition and ensure your vehicle's safety and performance.