OK, You guys have probley been asked this before. But I can't find it on here. I have a stock concert sound system. The head unit works fine. But after 18 years the speakers need to be replaced. What size do I need to get and what would you sugjest. I'm not doing anything except speakers. I might add a CD player in the trunk latter. I lesion to country and old school rock and want better then stock speakers. Its just my weekend crusier.