Searched and asked, and I think this is the senario?: IMS 3.1 will fit just fine, but will need '03 YZ shrouds if I want a perfect fit, and stock shrouds if I want to modify them lightly. Seat will fit if I add a spacer and/or modify the key hole to fit, otherwise I need a YZ seat too. Does that sound right? I want to order the tank, without surprises if possible.