What are removing? Their is another way that works grind two flat spots on each side of the screw and use vise grips to break them loose or try grinding a slot through the middle for a flat head screwdriver. If this fails continue ( if you dont mind it getting scratched up a bit) grinding the head completely off. The piece will slide off over the grinded studs with the piece gone the friction will be eased and a pair of pliers will easlily remove the remaing studs.