That’s good,I’ll adapt one of mine,so I can use my standard 2” refills,your link was stating unobtainable at present,e bay don’t list them.Search 'pipe paint roller'.
Alternatively, 'paint tongs' (do not confuse with paint thongs).
Budget Paint Tongs
Quickly paint wrought iron railings, bars or pipes up to 1.25 inch diameter.www.decoratingdirect.co.uk
your link was stating unobtainable at present.
HAUTMEC-Roller-Painting-Furnitures