Cadillac Catera? I need to replace the tensioner with a new one. The bolts are in an odd place I can't seem to break them and they seem to be made of a different material. I have heated them, I have used lubricant, I have used vice grips, I tried bolt out. I can't budge them, I think they might have been installed with an impact wrench. I am this close to finishing with my timing belt install, my serpentine belt install. I need to get this belt tensioner in so my wife can have a car. I have the new tensioner but it didn't come with any bolts. Any help would be appreciated.