Front shocks are the same for gsr and itr, but the rears are different. You will need itr rear lower control arms to run them. For itr springs, post a "want to buy" ad and keep your eyes on ebay, criaglist, etc. I'm going to itr springs myself, but still waiting to replace one blown koni/neuspeed sp3 shock. Why not just keep your agx's if their still cool? should help with the stiffer itr springs.