Help with what top rail and caps to order

Need help selecting the correct top rails and caps that will work for our pool. I do not know the brand or model of it. I have included pictures of what you ask. Please let me know - thanks!

Jenny

Size of the pool & approximate age of the pool? - 21ft round

This is a Delair brand pool. Unfortunately, we do not carry the top rails for that model. We recommend trying https://teddybearpools.com/. They carry Delair parts.