Cattman will have available a rear sway bar that fits BOTH 04 and 05 models. Cattman will have it available about 2-3 weeks for about $150, which includes the bar and urethane bushings. Its a "must have" for any 6th Gen Maxima. It will be the only one that I know of for both the 04 AND the 05 Maxima.
"Stabilizer bars are part of a car's suspension system. They are sometimes also called anti-sway bars or anti-roll bars. Their purpose in life is to try to keep the car's body from "rolling" in a sharp turn." -Howstuffworks.com