Thunk in right front
 

Gassed up my '98 SSEi to go to Cumberland, MD on Wednesday, and as I pulled out of the gas station I heard a thunk (as good a word as I could think of) in the right front area. Thought I ran over a stick. No stick. It thunked about 4 times on my way back home, about 5 miles, and I pushed up and down on the fender and could hear it thunk, but not as loud. Car has 126,000 miles on it and previous owner replaced the front struts at 60,000. Any suggestions? I parked it and took my GMC truck on the trip.