Welcome to the club! The headunit slot is the GM oversized 1.5 DIN. Here'* mine with the face in.
Well the stereo install is different in the +00 bonnevilles (as well as other newer GM cars) When you take out the stock headunit, mine was bose, there are no wires, just one cable ribbon. Somewhere there is a harness but hard to find, My wires were all tapped into the ribbon I believe.
You will lose the Radio display on the Heads Up Display, also the door chimes which can be saved with GM-chime (I think that'* what it'* called, I didn't get it) Also you'll lose your OnStar, Which also can be saved but cost some bucks. Think Onstar service is $250+ a year. Don't need it, I have a cell phone.
The battery is under the back seat also. Don't let any of this stop you though, I love my 01 ssei (the car itself) and I love my stereo system even more!
Check out my car http://www.cardomain.com/id/taylordssei
Any more questions?
2001 SSEi 13.731 @ 101.59--->PICS HERE <---
--Intense PCM--2nd gen LSD--3rd gen Rockers 1.9 --#105lb springs--oil restriced pusrods--Intense shift kit--TEP CAI--ZZP mod 3.4/3.2 --IAT relocate--TOG silver ceramics--SLP CAT--o2 fake--160 stat--PRJ 10.4mm wires--Autolite 104'* @ .055--MAP TB heat shield
--Custom mesh grill--Cleared front and rear corners--Angle Eye'*--Silverstars 9006+9005+H3--PONTIAC 3rd break light overlay--Embrodered PONTIAC head rest wrap--Arrowhead inlays for front+rims+steering wheel--Zaino polish
--Alpine IVA-D300 7in TV--two 10W7s--JL amps 1000.1 & 450.4--MB Q'* 6.5in Comps--Optima yellow top--5 farad cap--lots of dynamat extreme--Custom install w/ plexi and mirrors--Sirius radio--compete in Sound Quality!!!
------PROTECTED BY VIPER!!!!!!!!!!------