speakers on wall

[brunoffrance]

Hi the community;

I've just mounted my new quality "car" radio in the airstream ( with an A/S design: Sony CDX 6750 ) so the sound with genuine speakers is not really great;
i want to keep the original grills, screwed in the wall so the solution is to change the 4 speakers in the same diameter and space;

what is your best choice for that;

Thank you, one more time for your future advices and installation pictures;

Bruno.