The non CF version has an inset on both sides, the cf version has an inset on one side, and flat on the other side, so I had to modify the standoffs with my dremmel and make 1 side flat. I only used 1 standoff and modified the original back spacer to only take 2 screw lengths instead of 3, because the original backspacer was required to keep it assisted. If you don't want it as an assisted, you can modify all 3 mxg spacers to have a flat side and it will work fine.