Review on IDesign Plastic Replacement Toilet Bathroom by Brian Rogel

I purchased the iDesign square natural bamboo toilet brush and holder in April 2017. I recently tried to buy a new replacement black brush as the original brush was falling apart. I ordered a black iDesign brush and it wasn't big enough to screw into the brush handle. I would like to know which replacement brush fits this holder set. Who wants to buy a new $24.20 complete set every time a brush needs replacing? Can you help me with correct information including manufacturer and item number. Thank you for your helper