I need a bag to go on the passenger seat. I had a Tbag seat bag for my '03 wing and liked it but I didn't have a Utopia backrest on it and it fit well. I have the Utopia backrest on my '05 and don't think the Tbag will fit. I guess it should attach easy to the passenger grab rail and likely the luggage rack on top. If you have one can you let me know which one it is and the LxWxH dimensions?