Fluval 403 filter pads and parts?

I am having a very hard time finding pads for my Fluval 403 these days. I love the filter and it works perfect so I want to keep using it. I was wondering if there are alternative media that can be used? I use my own filter bags and carbon, BIO balls, and I am going to use the ceramic coarse media.

What can use in place of the Fluval foam pads?

Thanks!!!

Bump - no advice?