You want a component type speaker with separate leads for the tweeter and woofer, but in a Camaro you need the tweeter to be co-axially mounted (not to be confused with a "coaxial" 2 way speaker). Component sets like this are sometimes called "convertible".
Not too many companies make convertible components... MB Quart, CDT, Cerwin-Vega, Powerbass, maybe Rainbow...
Not trying to steer you around but the CDTs are nice and go right in, with good reviews all over this forum. Need help with stereo selection
Be sure to read the FAQ.
Edit: Damn WB beat me to it!