Use a handheld impact driver on those that will move. On the ones that won't budge, use an impact chisel. That is how I remove several of mine, both on the windshield hinge bolts and roll cage bolt. I didn't want to ruin the paint by heating them with a torch, but if you are replacing them that should work as well The chisel worked great and turned them out in seconds. I took my to a local body shop and they helped me. I have since got my own impact chisel. We drilled a small hole on the bolt face to give the chisel someplace to grip.