Best Kits 4" Speaker Adapters

New speaker adapter releases by Best Kits! They come from a variety of sizes that can be used when you want to replace your factory speaker with an aftermarket speaker that is a different size than your original one. Here at, we stock and feature 4-Inch,4X6-Inch, 5.25-Inch,6.5-Inch, & 6 x 9-Inch Speaker Adapters available at incredibly low cost. Shop now!

4-Inch Speaker Adapters by BestKits at