In all the research I have found that some IMS tanks fit better than others. It seems I should use a WR petcock from a 2003-2005 to turn the correct way to turn on and off. What I have not found is can I use the IMS tank with Unibiker radiator guards? or How much room is behind the radiator? This is on a YZ450 2009. Any input would be great or pics without the side shroud attached. Thanks!