I used this to replace my 7" filter sock. I have an eshopps sump and this thing fits perfect. The only thing I did is seal the upper portion with silicone so that water goes down through the bottom holes. I also used a foam filter to line the walls and then filter floss in the middle.
https://www.amazon.com/gp/product/B001ELW98K
https://www.amazon.com/gp/product/B001ELW98K