Looks liek the little plastic trim on the end has come off and the trim itself slid along an inchor so, not sure if you can buy the ends alone.Id just slide it back along and grab one one of the end bits from a srcappers mate
Yeah those trims just slot in mate, theres bits that stick out running along the back of them trims and the just slot into some groves on the sill, u can pull them on and off all day long if it tickles ya fancy