One of my aquaclears broke where the impeller motor screwed on, I went to get a replacement and the topfin pro 30 filters were less expensive so I got one of those. I really like it. It's similar to the aquaclear in that you can hot rod it because it doesn't take a cartridge but it has an intake sponge and it's roomier where the media goes. My 20 gallon long is almost not high enough but it fit.
I don't know if you can get replacement parts but at the price point you can get a new filter.
I don't know if you can get replacement parts but at the price point you can get a new filter.