Memphis filled the void with their 4" and 6"x9" Street Edge entry level speakers.
4" speakers replaced what 'was' there, even tho it wasn't much left and the 6x9's filled in the void of no bass or rear fill.
All in all, the install was easy cause the customer had the seats out and everything cleaned up ready for some sound.
Good thing was that the temp was right at 90 degrees so I got a nice little sweat going on a Saturday morning!
Cheers!