Check out this thread.
Rattle in auto dimming mirror
Hopefully the link works as I am doing this from my phone.
Sent from my iPhone using Mustang Evolution
2012 Kona Blue GT Prem 401A, Manual, 3.55, Steeda Pro-Action Shocks, Struts, Sport Springs, LCAs, Adjustable Swaybars, Adjustable Panhard Bar, BMR Relocation Brackets, Airaid CAI, MGW Shifter, GT500 Axle-Backs, 3M Clear Bra and Tint, Side Window Louvers, JLT Oil Separator, Staggered MMD Zeven Wheels and Mickey Thompson Street Comp Tires, Bama 93 Race Tune