I'm the 3rd owner of the Sno Pro 2000 mounted on a 91 GMC. (Yes, this is the original truck on which it was installed. I pulled the assy out of the frame to purge the old fluid and clean the screens, etc. There is a magnet 1" x 3/4" x 3/16" thick that was just stuck to the bottom. The parts illustration shows this magnet, but doesn't show where it goes. (The local dealers can't help me, and when I called Curtis, the guy laughed and said I had a "Dinosauer".