Drivers seat how do i take it out 2005 malibu drivers seat is sagging on the right rear

May be you can go in from the back trunk and locate the cables that release the seat .

I would look real careful under the seat and make sure that there is nothing obstructing the movement. Also check the tracks that it sleds on for pennies or anything else blocking it as well.

Here is a video of the removal of the front seats of a Chevy Malibu that is in the same series as your 2005 (this video is applicable for 2004 - 2012 model Chevy Malibu)
https://www.youtube.com/watch?v=2l5xLKNRa2g

Either a junkyard or a dealer item.

To fold-down rear seat on 2007 Chevy Malibu, follow these steps:
1. Open the trunk
2. Pull on one or both the handles located on the upper side of the trunk
3. The handle located on the driver's side will unlatch the bigger part of the read seat
4. The handle on the passenger side will fold down the smaller portion of the rear seat.
5. Once done, you will have a seat that's nicely folded down.

Yes there is access to the trunk from the rear seat but the bad news is the release for the seats is in the trunk on the top passenger side of the trunk.

yes but id look through the trunk to get at it

If you have power seats the seat adjusters are made from aluminum and they do bend.They are non repairable
Check all bushings on the suspension for wear

you will have to replace the complete assy. the cheapest way is look for a complete wrecking yard seat, or have yours welded at a local machine shop

go to a friend or a bodyshop. get a bumper adjuster. it has a 3 to 4 foot handle on it, with a hook on the other end. you can easly bend a bumper where you want it...