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I am not sure myself, but you could try Crutchfield. If your not familiar with Crutchfield they sell all kinds of Electronic equipment and they also have a number you can call and they can tell you what size speakers your bronco takes. Try www.crutchfield.com, I am not sure if that is correct if not just go to your search engine and look up Crutchfield.
regards,
cobra-bronco