Does anyone know where, or if, I can purchase replacement top covers for my above ground pool?

I am not sure if I am using the right terminology. I am talking about the covers that overlap where the pool joints meet, all around the pool. I have seen them called top covers, top seats, molded resin covers, etc. But, I can't seem to find any websites that sell just these pieces.

I have no idea where the missing pieces are. There were a few missing when we bought the house.

I have an older Johnny Weissmuller, 24 foot above ground pool. We just replaced the liner, and now I would like to replace the missing top covers, as well.

Thanks in advance for your help!