Are you needing replacement brush material for your boot or other brush necessary needs here is the place where you'll need to go.
This is by the linear inch. Below are lengths needed for various purposes
V2, V3, V9 = 14"
V7/V10
65mm
2.5 = 17"
4 = 22"
80mm
2.5 = 19"
4 = 23"
Mag Brush Adapter
2.5 = 8"
4 = 13