Typical passenger side rear quarter panel rust because of failed inner seem. I know, I know, I should have had this taken care of when I first noticed the paint bubbling. 2 shops quoted about $1000 to cut out and put in new quarter section and fix seem. Car runs great and only has 148,000 miles on it - '07 6-6. I look at it as $1000 is cheaper than a newer car with payments. My only concern is the rust eventually coming back.