Ok so I've been looking around here quite a bit and I've come to the conclusion that these are the things I need to buy.

Headunit - http://www.crutchfield.com/p_130DEHP4UB ... ml?tp=5684

I don't know what this is called but I'm pretty sure I need it - http://www.sonicelectronix.com/item_833 ... GM32R.html

I also am looking for something that will make the spot for my headunit fit a single din. ('03 Bonneville SE's are double din right?)

If that list is correct and includes everything that I might need to buy to install an aftermarket headunit please let me know.

that unit is discontinued from crutchfield..

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2 wheels and 2 pedals... much cheaper that way...

I won't buy it from there then.. I was just showing which headunit I was going to buy. I can buy it off of ebay or somewhere else.

there are several companies that make dash kits for your single din radio. Schosche and Metra are two of them. If you buy the Headunit on sonicelectronix.com you get a free dash kit and $12 off of the GM32r harness. If you buy from thier eBay store you can get a better price and still get the free dash kit and harness discount.

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2001 Pontiac Bonneville SE 3.8n/a 110k, PLIM, APN UIM, 180 T-stat, Clarion DXZ385USB, Memphis 6.5s/6x9s/12" PR sub, Kicker ZX700.5 Amp.
1999 Jeep Grand Cherokee Limited 4.7 V8 120k, WAAG Brush Guard, 2in Lift, SkyJacker Shocks, HD front driveshaft, Infinity Tweeters, 12" Memphis sub, Rockford Fosgate Punch amp
1994 Pontiac Grand Prix 3100 180k SOLD :(

also for the headunit check etronics.com and consumerdepot.com and also newegg sometimes has good deals

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt

im replacing my 05 deck

i bought the GMOS-09

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Cardomain link

Fully tinted, 5000K HID hi/lo & fogs, LED conversion (interior/red rear signals/reverse light/license plate/trunk/sun visor/glove box/switch backs), turn signal mirrors, JVC KW-NT3 Navi & BT, KV-CM1 Camera, 2x JL 13TW5, JL G-Max, black & chrome emblem, 20" black & red, clear corners, center tail light up, half tinted tail lights, cross drilled rotors, Hawk ceramic pads, and more..

Black GXP. One of a kind. RIP.
G35 Coupe 6MT. Stockishhh