What you do is... Cut the slat our with a blade or whatever, but not right at the end of it. Like 3/4mm from the edge. Then get a flat metal piece or something of the sort and heat it like mad. I mean very very hot. Then press the 3/4mm thats left from the slat on the bumper with it. Will be flat, just how ya want it to be!! It might need a touch of paint over it afterwards but its not necessary! Hope it helps! P.S -- When we was doing the SR's, we set up a garden fire with cardboard and wood JUST to heat up the metal rod, the SR's bumpers got to be perfect! ;)