Not sure fraya but i'd like to know also. I bought 4 mounts from Rock auto (3 engine mounts and 1 transmission). The transmission mount did not match up with my car. It looks to be too small so i have to return it and go OEM. Also the passenger side one is kind of difficult to do if you don't go OEM. If you go to the one minute mark of this video he'll explain the benefits of OEM although it was a lot more than what i paid from rockauto.
https://www.youtube.com/watch?v=LCbtluiDZxQ