Didn't they only use 6.5" Bose in the 90 models? Mine were 4" Bose all around.
John
:If you are leaving the rear Bose enclosures in you can get away with 6.5 inch speakers in the enclosures. I will be running my mid bass in these enclosures (kickers) and 5.5 mid range in the doors along with tweets mounted up high on the doors