I currently am looking to replace the speakers in my 2001 Bonneville SLE non-bose system. I want to replace front door and rear door speakers. Does anyone no the sizes for these because I've heard all kinds of different numbers. I still want to be able to use the factory grill to go over them as well. I also want to install a head unit, a Kenwood DPX303, which has a peak of 50 watts x 4 channels and an RMS of 17 watts x 4 channels. Will this fit and will this be good enough to power 4 Infinity speakers with 180 watt peak and an RMS of 60 watts or do I need an amp? What kind of kit do I need to retain the door chimes and for installation? There'* a lot of questions I know, but I would appreciate any and all help. Thanks.

Front speakers Front Door: 6-3/4"
Rear speakers Rear Deck: 6x9"

6.5" will also work in the front doors

Thanks

wiring harness GMOS-05
dash kit should be 99-2001 or 2003
these are all METRA numbers. As far as an amp is concerned, it will make a big difference and it will sound better than without one because the sound will be fuller and ultimately louder but that depends on if you want it to get really loud or not. If you have the money, id go with a 4 channel amp for sure.