Ok, I did truly try to search for this first but I don't have search rights?

Anyway; are there any sources online for base rails? I just can't seem to connect.
I just bought a used 8 year old pool and the base rail is a little rusted out. It might work but i'd hate to have to replace it in another few years.

What do you guys think? The sides are mint. Can't understand why they would just use aluminum in the first place?

Thanks.