I would have bet even the grill was the same?47-53 are a lot like old Harleys and inter change so easy.Maybe the years of grills are not just alike and its been interchanged?I like wing glass to use a lot and like the 51-55 better just for that and would have got a pair if cost the same if had to replace a 47-50.Guess if this comes up better check into this more.Sure lots on here will know for sure.