This is the Advance Poly Wheel #56440450.Fits the following models:Whirlamatic Twin 2000Hydro-Retriever 2052ConvertaMAX 28I-MAX 28HDConvertaMAX 34I-MAX 34HDConvertamatic 240LX-JConvertamatic 240LXHydro-Retriever 240HDConvertamatic 240LX-JConvertamatic...