I also have stock 2.5 RS mounts in a box ready to go. Not 100% positive if they work/fit, but I'm guessing they would. Will also have stock wrx mounts sometime later this year (not yet).
^^looking for low(er) mileage OEM ones. Mine have about 105k on them and are tired, very tired. What do you have and what would you want for them?
Mine are 01 RS w/ about 85k miles on them. In quite good shape. Can post/PM pics later. I'm thinking maybe $20 is a decent deal? Comes with the rubber and the plates, in case that isn't assumed.
Etchy is correct, the threaded holes on the EJ series blocks are the same for the engine mounts across the board. Any EJ engine mount will work on your block. If I were you, I'd go to the dealership and just get a set, they aren't that expensive really.