The hinges on these original arms tend to get worn out which will cause irregular movement and can eventually burn up your wiper motor or bind up the linkage. If your wipers do not move in tandem, this part is the culprit! To test if your unit is worn grasp the driver side wiper arm and move the arm back and forth gently. If the passenger arm does not react to your every movement this assembly needs to be replaced. It is an easy to replace part in that you can remove the cowl panel behind your hood to access it. Fits all 1971-73 Mercury Cougar and Ford Mustang.
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