Squeaking Wheel

I have a 97 Civic LX with about 130k on it. When it gets cold, a squeaking sound started to come out from the right back wheel well going over any bumps etc. Took to the mechanic and replaced the struts. That didn't help, so replaced the bushing. Well that took care of it for a week and the sound is back, but not as bad as it used to be.

Any ideas? Even the mechanic is kinda stumped on this one...

Anybody????