I replaced all of my shocks/ springs 5k miles ago with Koni shocks, and the tie rods/ end links about 22k miles ago with Moog adjustable ones. The reason I would think it's a bushing or off-centered sway bar is the fact that it's coming from under the sub frame.
2003 Focus LX Red (RIP)
2002 Focus SE Red (SOLD)
1995 Jetta GLX: VR6, Intake, Exhaust, Lowered, 5-speed, you get the idea.