Should use standard carbons for sole/fhp/acc motors. Off hand I seem to remember using Zanussi ones
General spares from Connect or you could try James Armstrong as they are agents for the commercial ASKO machines which are basically identical or ISE
Or, you could email Dave as we keep them in stock if they’re the same as the 1406 and, even if not but are available we can factory order them for you.
The alternatives don’t have the protection in them but should work although I’m not sure how well they seat.