We bought a above ground pool with a J bead liner that has 54 inch walls. I am not sure of the brand but , it was sold by Oasis pools in NC and is the Aurora model. It is soooo nice, like new and we gave $600 for it. It is made totally of stainless steel and resin. I have two questions. First, where can I find a 54" liner ? I have only found two online that I am not loving. My second question is when I back fill it does it need a retaining wall since it is stainless and resin ?