We did not know and had to think for a moment what the advantage would be of a roll of wiper rubber.
But with a bit of goodwill we could do something with the idea.
The tip of AMK reader Ludo Verheirskercke was that he had bought window wiper rubber as 'meter value' at www.dustonallard.com
A nice site about all kinds of possible wiper blades is www.swissint.com. 'Refill' also provides a lot of replacement rubber. We have checked, but most suppliers supply the replacement rubbers in lengths up to 80-100 cm. And that seems enough to us.
Oh well, it's just a know