I don't know why the original didn't work on my daughter's 2008 Mazda3. In fact they all failed so I replaced the driver and passenger side with bouncer drives. These parts are actually better than the original. They have a metal mount if the OEM is mostly plastic. The best part is that both fit, both work and solve the problem. Replacing them isn't easy, so make sure you have spare fasteners (they break), door panel removal tools, patience, and a manual or video to help you out.
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