Despite repeated soakings in Pb Blaster, I broke all four of mine. Got pissed. I drilled through two and managed to snap the tap off in the second hole. Got more pissed. Got the hole saw out, cut four nice holes through the floor above each bolt (after removing the trim, drilling the tie downs out, and pulling up the carpet). One hole went a bit too far, cut the shock brace. Cussed. Took a break and left my buddy's house. Came back later. Buddy had knocked broken tap out of second hole (good), drilled through the third bolt hole (even better), and broke a drill bit off in hole number four that had gone off center. Bad mood returns. Then found out all the drill bits we had between us were now dull - even my titanium ones (damn). This did nothing to improve my mood. Contemplated buying a Drill Doctor. Got back to business. Found another bit. Had a bit of luck. Started drilling. Got two metal shavings in my right eye. Ran out of luck, cussed (a lot), and fumed a little that there were no safety glasses around. Found tweezers in the console, pulled out both pieces of metal. Felt better. Began drilling again. Broken bit came out. The remainder of the original bolt also came out. Things begin to look up. Stuck longer bolts in from top (easy now). Spent an hour putting bar pins in shocks. Slightly tore both rubber bushings. Got pissed again but finally pushed them in. Finally managed to get the shocks installed, Finally! And in the month since: the floor is still open, the carpet still loose, the spare tire is just laying there, and the rust (and mud) I discovered in the passenger side quarter still needs attention. Maybe when I am back in the mood... or at least until the bar pin eliminators arrive, I'll finish. Until then, I just keep telling myself that the duct tape will hold and that POR-15 and seam sealer are my friends.
Good luck with your project!