I need replace some top rail on above ground round 18 * 36 pool. Need to know where I can purchase these metal rails. My are rusted.

I am very surprised your rail rusted, never saw one that wasn't aluminium. What brand pool do you own?

Muskin purcased at sears 1999ish

You question is?? You know you can start your own new post by clicking ASK ABOUT POOLS, right?