Sponge for Protein Skimmer

[weemanpow3]

I have 2x Seaclone 100 Protein Skimmer's for my reef tank and the sponge pads are really worn out. I looked around on the net and didn't see any information where to get them. So now i'm thinking that I could just cut out and fit the sponge myself. Is their any specific sponge that I have to use? Is this something that I could get at a general store? My local fish stores are all closed down and the next one is about 45 minutes away. Thanks