Always choose a car radio replacement that is made for your specific make and model of vehicle. The radio size is usually measured by Din size. Cars have either a single or double din, which you can find in your owner's manual. There are also different types of receivers.

The Best Car Coaxial Speakers: Focal PC 165 FE 6-1/2" Expert Flax Evo 2-Way Coaxial Speakers. The Best Value Car Coaxial Speakers: Kicker DSC650 DS Series 6.5" 4-Ohm Coaxial Speakers - Pair. The Best Car Coaxial Speakers Under $300: Focal 165 AC Access 6-1/2" 2-Way Coaxial Speakers.

Pioneer has always had decent mid-tier speakers for a good price in my book. Their low-mid end tweeters leave a little to be desired in the clarity department (a little harsh, some EQ is needed to get them to sound good), but overall a good budget speaker... like any speaket though, just protect them from the sun.