A little spray silicone took care of the problem for me.
The can of silicone spray is fast becoming my best friend.
nissancrazyhorse: Take a can and spray the rubber components, one by one, until you find the source of the squeak. You'll eventually discover it by process of elimination. Then you can take action on the squeaking part...
Also, sources of sounds can be deceptive; I thought I had a rear-end squeak once, but turned out that the sound was being channeled through the frame from some bushings up front (weird, but acoustics do that sometimes).
One of the toughest squeaks I had to locate was due to the steel collars I used on the sway bar (to replace the stock aluminum ones). The rubber from the sway bar bushings was dry between the collars and bushings, and driving me nuts every time I had a slight bounce (front or rear). A little silicone spray takes care of it temporarily, but it eventually comes back. Just an example of a strange squeak source...