I just did this yesterday. You have to buy a whole new control arm from the dealer. The good thing is the whole setup with new control arm, bolt, and washer is only like $45 from the dealer. You need to cut the bolt off with a sawzall. First remove the nut from the opposite end and then cut through the bushing as close to the frame as possible and then pound out the control arm and if the bolt didn't fall off, turn it with a wrench and it should fall off. There is a write-up on tunerz if you wanna find it.