This is a genuine Mazda window regulator, part number NC11-58-590G. If your power window is stuck, slow, or making grinding noises, this is the factory part to fix it. Direct replacement—fits and works exactly like the original. Saves you from dealing with iffy aftermarket parts. You'll need to know your specific Mazda model to confirm compatibility. A bit of DIY skill is needed to install, but it's a straightforward swap once the door panel is off. Get your window moving smoothly again with the real Mazda part.