Can anyone provide me a full brake parts list for 2005 Malibu Maxx LT 3.5L V6?
I need to replace everything due to brake fluid contamination

Assuming 4 wheel disc brakes

M/C 174-1008 I think the reservoir and cap come with a new master cylinder, if not you'll need to clean or replace the reservoir and replace the cap.
Front brake hoses
L/F 176-1201
R/F 176-1202
Calipers
L/F 172-1675
R/F 172-1676
Brake hose washers you'll need 8 total 21012356
Rear brake hose you'll need 2 total 25874786
Rear calipers
L/R 172-1677
R/R 172-1678
BPMV Brake Pressure Modulator Valve 22691085

Do you know what needs to be done to flush the old fluid out? These numbers should be good, from ACDelco online catalog. Having the full VIN makes it easier.

I need to replace everything due to brake fluid contamination

What was it contaminated WITH ??

"Everything" doesn't come in contact with the brake fluid.......so everything wouldn't necessarily need to be replaced.

It was contaminated with Power Steering Fluid. I contacted the dealer and they said that I should start with Flushing out system and changing Master Cylinder. They said that they are not certaing that it went through everything because the lines were always full to begin with and that it might have never left Master Cylinder. That it could be having issues simply because the master Cylinder is ruined, but not necessarily the full system. They said they dont want to tell me to spend 2Gs if its not fully necessary and that anywhere I go is always going to say to change everything because of being afraid that it will backfire on them. Also they said that I could get a brake caliper kit if anything and clean everything. the calipers only have the two rubber seals and they only run like $10 for each front caliper rather than paying $70 per.

It was contaminated with Power Steering Fluid. I contacted the dealer and they said that I should start with Flushing out system and changing Master Cylinder. They said that they are not certaing that it went through everything because the lines were always full to begin with and that it might have never left Master Cylinder. That it could be having issues simply because the master Cylinder is ruined, but not necessarily the full system. They said they dont want to tell me to spend 2Gs if its not fully necessary and that anywhere I go is always going to say to change everything because of being afraid that it will backfire on them. Also they said that I could get a brake caliper kit if anything and clean everything. the calipers only have the two rubber seals and they only run like $10 for each front caliper rather than paying $70 per.

If you're doing the work yourself, I don't see a problem with just the master cylinder and flushing the fluid. If you're paying someone to do it, unless it's under the table, I'd say the person doing it should think twice. It just comes down to liability. No shop in their right mind would consider it. People sue for just about any reason anymore and doing something like this opens the door to a lot of headaches. It's not just you they have to worry about. Let's say there's an accident and it can somehow be related to this contamination, that shop, if there is one willing to do it, has a date in court coming almost guaranteed. I just want to make sure you see it from the side of the shop if you have to go that route. In this economy there may be someone willing to do it off the books and cash only.

Hopefully this is something you're doing and you have the ability to know whether it's fixed properly with just a master cylinder and a fluid change. You can rebuild the calipers if you know how. To pay a shop to do it, you probably won't save much after the additional labor is added in. Not hard to do but it takes time. Last few times I tried to get seal kits, nobody close stocked them. The front caliper seal kit is 22705328 and the rear is 173-0539. I don't know if this is enough to do both calpers or if you'll need two of each kit. If the vehicle wasn't driven after the contamination, you may be okay. If it was driven you may not be so lucky. Either way good luck.