If you've lost your battery terminal cover, then this is what you need. Mine fell off on my 2017 Forester and I ordered this to replace it. It doesn't fit, which is no surprise since it wasn't made for it. So, I've had to rig it up with some electrical tape to keep it in place. I'll order the proper replacement part when it becomes available for my 2017 model.
This item does not fit on all impreza models of the noted years. I have the 2013 Impreza limited and this cover does not fit. Otherwise the quality is good.