There are lots of threads on dealing with those upper shock bolts. I tried many of the suggestions (except I'm not brave enough to use a torch next to my plastic gas tank) but ended up grinding the spot welds off of the nut using a slightly worn 3 inch grinding wheel chucked into a drill working through the large hole between the shock bolts. I replaced the factory hardware with a similar sized bolt and nut. I could have saved a lot of time if I'd tried this first.