I own a 98 F-150 reg. cab, and I'm looking at replacing the factory door speakers. I know very little when it comes to speaker specs. There's a set of 3-way polk dx7 6x8's that look good. Their running 40RMS and 130watts peak. My factory speakers are 25RMS I think, but not sure what specs are for the factory deck. Can anyone give me some insight into what to look for?