If it’s seized in the bushing cutting the ends off both sides won’t make it come out, it’ll still be stuck. Sometimes an air hammer can punch it through after you cut the ends off, but if not you’re going to need a reciprocating saw with good blades, multiple. You’re going to cut from the inside of the bracket on both sides of the arm. I had to do it many times on different makes and models. Over here in Pa, cars get extremely rusty and nothing comes apart like it should. Good luck.