You got it together right.
You want to rubber washer up against the rad so it doesnt chafe through.
Also with the flatland rad guard the rad plastics bolt to the rad not the guard... if you tip over on the plastics it bends the rad.
You can stop this by adding a thin strip of alumumium plate to where the plastic bolts to the rad to spread the load out onto the guard. I found this on this site some wheres if you do a search you'll find it. I did this to mine after bending the rad a touch, I can add a pic later if you dont understand what I mean but it will take me a few days with work n stuff lol.