Thank you Sheryar bhai 
I would suggest to go for Focal PC165 in the rear. Check out specs here.
Focal PC 165, car audio coaxial hifi speakers to customize your car sound system.
PS165 is a polyglass based component system, and PC165 is the same polyglass coaxial speaker, this would be the best suited combo. Also, its round so you won't require any alteration in the rear parcel. Just remove factory speaker and in the same round hole this would fit it. No alterations means no noisy vibrations.
Consider the Pioneer amps Soundmaster suggested, these are at great prices either. After Prs series these amps could be a better option.