Does anyone know the speaker size for the rear speakers on a 2009 Ford F150 Lariat with the factory installed Sony Audio System with subwoofer? I know that the front speakers are 5"x7 "/6"x8" ( Crutchfield confirmed ) but would like to know what the back speakers are so I can replace them too. ( Crutchfield doesn't know yet for sure, I was surprised? ) Any more info on replacing or enhancing the subwoofer and the sound of the system all together itself would be greatly appreciated.

 

Why would you want speakers behind you?