Discontinued Casement Hinge. Replacement Available Old Style Truth Hinge with 1-1/2 inch metal and 1 inch Plastic clip; # A63R / A63L stamped in long arm and #6993 in short link. Used Primarily with Bilt Best and Quality casement windows. ( Top and Bottom Track goes from jamb to jamb and is sized depending on window) Replacement - Use 55175Must replace top and bottom hinges as a set. The old Bilt Best casement window had a continuous track that went from one side to the other. - This must be removed.New hinge # 55175 is placed all the way to the corner of the frame.