HI Nick
I've just had my stereo returned back to stock, including replacing the front and rear speakers.
I ended up with some Sony 6.5' mids in the front and some 6.5' Coaxial's in the back. XS-XB1641 XS-XB1621C.
The rear woofers are 8' in the rear, I tried some NOS ones however they did not...