NOT! What a PITA!
Got a set of Polk Audio 461's. Since these are 4x6 I had to remove the speaker mount to enlongate the hole. These speakers sound great back there. Not super loud but a nice rear fill. Both my stock rears were blown and flapping...making some ungodly sounds (and no, it wasn't the music choice).
Next up will be front speakers when I find a deal then a small (10") sub and amp.