It comes off of these models.
88-90 760
90-92 740
91-95 940
92-94 960.
You flip it upside down, cut off a few inches from the ends, drill corresponding holes to match the valence in the lip, and attach with what you want. Depending on the shape you get it in, you might have to refinish it. I did. I filed it down, filled with small amount of bondo, sanded, painted with some rubber coat paint, and topped it off with some textured paint. Came out great.