Kockney koi extra large black box filter with media but new sponges needed

Hi I’ve got this see skimmer I’m trying to find a basket like this with smaller holes or find a way of customising this one. Has anyone else tried this and succeeded.

Anyone selling a box filter

Is anyone selling an external filter for a 200+ litre tank?

Wanted Im looking for a filter either external or pond filter please in close to s40 area please as i dont drive thank u