I have a 2004 XC70 and was thinking of upgrading the factory speakers. I just bought the car and wanted to know speaker size, location and mounting depth of location. I looked on Crutchfield and used "Find What Fits Your Car" feature and they give me two different sizes and also a warning of "Modified Fit". I'm not new to car audio as my Jeep had a great system but with that I started the whole thing from scratch so no limitations. Can someone give me this info or direct me in the right direction? Thanks.