Again most part makers will not cover the labor, (let alone send another part without receiving the first one back). If Qrack agreed to do this, then thats between them and the shop not you. Qrack, and most people who commented on this thread think its not the rack, or "both racks" as you seem to think.
Estimated rack replacement I'd (generously give 7 hours, tech paid at most $20/hr = $140. Should be much faster second time. Tie rod end for 06 wrx $30 retail at most. My offer still stands $250.