i bought those 6x9s on cyber monday have em installed and love them!
as far as speaker size goes... i fit these 6.5 in my 05 door with absolutely no modding or anything..
Pioneer TS-A1674R (TS A1674R) 6-1/2" 3-Way A-Series Car Speakers
for the record i used this amp to power the rears and fronts
http://www.sonicelectronix.com/item_...od-X450-4.html
not sure why its discontinued but you can buy it here
http://www.amazon.com/Kenwood-eXcelo...Kenwood+X450-4