Our speaker adapters are made to the highest quality standards, right here in the USA. They are made from CNC machined PVC plastic, and will not rot like MDF (medium density fiberboard) or wood. Some companies produce a few models of universal speaker adapters, which they intend to fit a lot of vehicles. The problem with producing universal speaker adapters, is that they never really fit any one vehicle very well. We never produce universal speaker adapters. All of our speaker adapters are vehicle specific, to ensure a perfect fit. In addition to proper fitment, our speaker adapters are tough as nails. Whether replacing worn speakers or simply upgrading, our speaker adapters will allow you to install your aftermarket speakers with ease. Call us with questions 412-260-6835