Ryobi have told me that my excellent vgc VC23 cleaner is no longer supported and no filters are available. Only 8 years old and due for the scrap heap ( I dont think so Ryobi ) After much searching and trying of other manufacturers filters I at last found one that fits. The Rowenta Bully Collecto RU100 Has a cartridge that is of the correct dimensions and fits perfectly. The only draw back is that it only has a hole at one end so the original retainer disc no longer holds it in place. No problem though as the fit is so good that the vacuum suction does the job quite well. I may explore the options of cutting the other hole or devising another fixing method sometime. I have tried it for a few weeks now and the Rowenta filter works a treat. I have ordered 6 of them for my stock.
I hope this helps others who may have a cleaner of this type and others that may be the same but badged differently.
regards