I’ve literally spent hours and hours searching. Picked up a new mustang a week ago. 80 miles on it. 200 miles later from 60-80 miles an hour I have a horrible rattle which sounds like wind sheer but only on one side by tje passenger mirror. I’ve chased removing the passenger rear interior quarter and padded it all up. Still rattles Fit and finish on a new car wasn’t what I expected. At least I got a good price but now I’m left chasing then rattle near the passenger door and don’t really want to leave it at the dealer since most arnt able to help according to replies .