The yellow Pole painters use will fitJust looking on the website and all I can see is the pole attachment?
Do you use your own pole?
I use the one https://m.screwfix.com/p/no-nonsens...n-pole-30-50-780mm/81178?filtered=true&_bck=1
£8 but its sturdy and adjustable. Bought a harris one for twice that before and it was bending.