Hello Shaylee and welcome to TFP!
It is kind of hard to figure out your question from your post but I will take a guess and try to help you a little. You stated that the pool has a new liner, what style of liner is it, overlap, bead, or what? A picture would help greatly to help figure out the part(s) you are talking about. If it is an overlap liner, are you talking about the "caps" that go over the edge of the pool wall to hold the liner in place at the top of the wall? If it is an overlap liner that is the coping and is plastic pieces approximately 3 or 4 feet long and just snaps over the edge of the wall. It is pretty universal and can be found online or at most pool stores that sell replacement liners.
Are are you talking abouth the metal or resin top rail that goes around the pool edge?
We really need more information and like I said a pic would be very helpful.