JBL 6520 coaxial speakers (165 mm).

JBL Club 6520 2-Way Coaxial Speakers 6.5" (165 mm). 

The well-rounded component system 
It's simple. Your factory speakers are getting you down. JBL's Club Series speakers are the clear solution. JBL equipped these Club 6520 6-1/2" coaxial speakers with UV-resistant polypropylene woofers for stellar performance even under the stickiest (or chilliest) environmental conditions — after all, your car door isn't the most forgiving place to reside. 
Strong performance 
The speaker's patented Plus One™ woofer structure extends the surface area of the cone to give you a better bass experience than other speakers this size. And an edge-driven PEI tweeter expands the high-frequency range, so you'll hear musical details that you never heard from your old speakers. 
A match for any system 
The Club 6520's low-impedance design safely draws more power from your car stereo to give your music extra punch, but you'll get even better results feeding them power from an outboard amp.