need to replace Bristles on dust shoe

I need to replace Bristles on dust shoe but do not see them in the parts store.

Any recommendation on where to buy..

 

Where is what I found out on replacement bristles

It can be purchased through KentCNC https://www.kentcnc.net/nc/2-3-brush

the openbuilds dust show is the the KentCNC Mini with 65mm option and 2" Brush Ring.
MINI Split-Shoe