KICKER CS Series 6-1/2" 2-Way Car Speakers with Polypropylene Cones (Pair) Yellow/Black 46CSC654 - Best Buy
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JBL Stadium 62F Stadium Series 6-1/2" 2-way car speakers at Crutchfield
Kicker 46CSC54 CS Series 5-1/4" 2-way car speakers - Breakers Stereo and Performance
Pioneer TS-600M, 6-1/2" 4-way Coaxial Speakers, 320W Max Power | 11mm Tweeter and 11mm Super Tweeter and 1-5/8" Cone Midrange | Coaxial Speakers | (Sold in Pairs) - Walmart.com