[npdang]

I'd say maybe a Vifa mg 5.25" 4 ohm, mated to an LPG tweeter. Crossover can be as simple as a cap for the tweeter, and an lpad.

 

[npdang]

I'd say a cap around 3khz, and maybe an adjustable lpad so you can attenuate the tweeter. If you can go active even better, just use your headunit/amp's crossovers and level control.