Greetings from Philadelphia. I am looking to purchase additional pop up pool cover anchors to replace some that have gone missing over the years. The pool is most likely around 25 years old and I was not the owner of the home when it was installed. I am having a problem finding out who manufactured these anchors. The pool decking is stamped concrete. I've attached some photos. Does anyone know who might make these? I'd be grateful for any assistance.