High pitched metal on metal tinging from front end?

My car is lowered with Eibach Sportline lowering spring for over 5 years now. I have a high-pitched metal on metal tinging sound coming from the front end of my mustang when i hit a rut in the road which I haven't had previously. I recently replaced the front sway bar bushings with prothane aftermarket bushing as well as new sway bar end links to see if that solved my issue. It did not. My friends think it could be a ball joint or strut/strut mount. What do you think it could be? I'm very frustrated and don't want to throw the parts cannon at it. Thanks