I had the same problem with my mirror, just go ahead and replace. You can go to ebay to find a mirror or sometimes you can find a painted mirror as the color of your car.
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Exterior- stock painted black wheels, clear corners, stainless steel grill, cross and drilled front and rear rotors with evolution brake pads.
Coming soon- 18 inch black mustang bullet rims, GT/GTP rear bumper, tinted windows.