I was installing new flooring and wanted it to go under the threshold. We were doing ok pryng it up a little and sliding the new flooring underneath but we eventually decided to just pry that piece off and replace it later. Little did I know that I would not be able to find the correct piece. Its an aluminum threshold for both the exterior door and storm door. It seems as if it was part of the original frame, since it was screwed into the frame. Any suggestions are appreciated.