I have the Warn 9.5 XPS and had to make some modifications for the solendoid box to fit in the bumper. It will not fit attached to the winch itself. I used the mounting bracket that came with the winch and welded a piece of metal angled at 90 degrees to attach it to a cross member in front of the radiator. This allowed me to access it pretty easily (see pic, lower right opening). From what I remember, the directions for the Shrockworks bumper suggested attaching it to metal arm in front of the radiator, but access to it would have been awkward and inconvenient. I assume that most solendoid boxes will not fit in the bumper if attached to the winch, AND you still need easy access to it. Just my 2 cents...