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For some great information and expert advice on anything related to the Ford Mustang,
you can go to AmericanMuscle's tech guides section

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Windshield Repair Tips:
When you get a rock chip or crack in your windshield, how do you know if it can be repaired or if it must be replaced? A standard rule that SunTec's windshield replacement technicians apply is if the damage is no larger than your thumbnail, it can typically be repaired.

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