This clutch kit is for your Subaru WRX from 2018 to 2021. When installing, make sure to double - check the part number to ensure it's correct for your vehicle. Since the alignment tool and grease are missing, you'll need to get those separately. Be careful of the rust on the clutch plate and disc; if it seems excessive, you might want to clean it before installation. As for maintenance, keep an eye on the clutch's performance. If you notice any slipping or strange noises, it could be time for an inspection. Remember, clearance items can't be returned, so make sure you're satisfied with the product before using it.