My 98 S70 has two different rattles in the front end: a clunking sway bar rattle and a high-pitched rattle that sounds like a tin can bouncing around in the front end. Can the sway bar rattle be fixed by just changing the bushings, or do I need to swap the whole sway bar? What is the likely source of the "tin can" rattle? The car has 115K miles on it and runs well except for these annoying rattles.