I'd call Rans and ask them which seat bag will fit on their seat. Maybe Rans, Arkel, or Angeltech has one that will slide over the top of your seat. They usually have webbing on the side of the seat you sit on, and you just slide it over the top.
Another place to do a search for this subject or just ask questions is at Bentrideronline.
Last edited by Dchiefransom; 07-05-09 at 04:54 PM.