If it is the one with the bag, you do have to order the whole arm assembly. Mine is broken also. I have tried to glue it several times and it works fine till somebody put weight on it. The one on Ebay will work if all the places on the cushion part where the screw fasten, are intack. When I took mine apart the back four above the hing are not solid. They are in the shape of an L with angled sides. Then a metal clip is slipped over the lip to hold the screws. When the flat part of the arm rest that connects to cushion breaks it breaks the last two clips off. I have foundi it is impossible to glue anything in there to hold the screws and stay. It seems everytime I take the ST to have something done, it comes back with the arm rest broken again. I am going to check with a friend of mine who sells used cars to see if he has a place I can get it cheaper. I am also going to see if any junk yards have one. If I wasn't plaining on getting the 07 ST job 2, I'd go on and get a new one. I've also got to get a side panel for the front drivers seat because the plastic bracket broke on it too. There needs to be something to fill in the gap when the arm rest is down so that when presure is put on it it doesn't go down and break. I hope this makes sense, cause I'm writting at this at work.
Darrel