I bought real vintage speakers from the nineties, they are still powerful and have a great sound. Unfortunately I had to replace my PA with two fat PAs to provide enough current. :
BOSS Audio Systems BE5768 Rage Series 5 x 7 Car Door Speakers - 300 Watts Max (per pair), Coaxial, 4 Way, Full Range, 4 Ohms, Sold in Pairs, Bocinas Para Carro
Infinity Kappa 463XF 120W RMS 4"x6" 2-way Coaxial Car Speakers