In free agency and possible trades. As for the rb's ,free agents look like Ahmad Bradshaw, Shonn Greene, Michael Turner, Mendy, DeAngelo Williams will be out there. Possible trades Maurice Drew, Reggie Bush, Steven Jackson. Wr's Wallace of course, Dwayne Bowe, Wes Welker, Greg Jennings, Brandon Lloyd , Randy Moss, Percy Harvin, Darrius Heyward-Bey. So if the Steelers would ever decide to use free agency to plug some holes on offense there is some options out there.