Window parts

hi my window from 1996 is broken. I need that plastic piece on the right. I'm sending you pictures again, but I also need to know if you sell that plastic covering that goes on the top little corner and if you sell these little white things each window that I have is made by you because the book says it and each window has these little things on it and I have a couple of them that are missing.. but each window has four but the most important thing that I need is the little plastic piece that goes inside the window so that the window will not fall and I need to make sure that that's all I need. Is that piece cause I'm gonna buy some extra and if you would also tell me what these four little pieces are that are on each window and if you sell those and if you sell the little piece at the top, thank you so much and God bless you. I'm trying to sell my home and get back to Alabama the sooner you answer me so I can order these. I would appreciate it