I found some that work, but can't remember the name of them. Got them from a motorcycle/atv store online that has an expandable adapter for the holes on edges of plastic racks. My atv has to have floats on it, so these work on the sides, but there is a bushing that fills the holes, and as you tighten the bracket,it expands in the holes. I will try to find name but I searched under Polaris auger rack.