They are both stock\OEM that's the way my SP2 came... BUT it's been so long ago since using them and the OEM aribox.. I don't remember which is the "Right" and the "Left" side? LOL Actually that's "Front" and or "Back"
Try RonAyres web-site the comp.fishes might show which is which..? IF some one here doesn't chim in that knows..
Peace Mav.