looking for the right top plate

I need to replace several of the top plates from my above ground pool. The problem is to find the right ones out.

The rails and connectors are fine, but some of the top plates are broken. What model are they to order several of them?

See attached phtotos:

You have a Cornelius brand pool. Unfortunately, we do not carry Cornelius parts.

We recommend trying http://www.corneliuspools.com/english/ht/index.html

You can also try https://loceypool.com/pool-and-spa-supplies/parts/