It goes straight on. Just put the metal rod through it, exactly as you do on the EA one. Even bolts into the same place.
The only slight difference was that , in the EL, the arm rest has a metal bracket under it, which the bottom of the little finger grip thingy in the arm rest screws to. I don't think this would be entirely necessary, though, but even so, just get the bracket from the wrecker, drill & bolt it to the door, just in case.