I have just googled the bellows number and it pops up in several places. Mostly in Germany but also in France – see this link.
https://www.ventouses-soufflets.com/fr/soufflets-ronds-d-61mm-a-d-100mm/172-1148-nbr-soufflet-nbr-d70mm-lmin-20mm-lmax-160mm.html
Prices all over the place and all seem to be awaiting stock. I will have a really good look through the possibilities tomorrow.
thanks again.
Roger Grix