I had a couple that had lost parts and hence just the wire hanging out of the ceiling can riled up the wife continuously. But I could never seem to find these. Finally got a pair off Amazon and they fit and worked perfectly. Not cheap but good quality construction, loss of parts is only because my offspring fool with things they don't understand and cant fix. So now I made them put these in supervised and no more grief. Grief reduction is a major motivator around here.