Even though this is listed as being for Delta saws, it fits my new Craftsman 22124 perfectly.  Unlike cheaper inserts made from UHMW plastic, the phenolic material used by Leecraft is extremely stiff...no warping or flexing.  Fine adjustments can be made with the four leveling feet, and the fit can be snugged with a side mounted set screw.  It's prenotched underneath so the initial blade cutout goes very smoothly.