Chocolate molds

Hi to you I want to go ahead and bake these stunning cookies for my daughters engagement!! I am stuck because i cannot seem to find the chocolate mold/silicone to make the beautiful square chocolates with a round centre (to be able to place the filling) Can u perhaps send me a link or tell me where you think i can purchase this item from or advise me at least what it is called many many thanks pls reply as soon as possible