Has anyone found a rubber backflush disc that fits the VST baskets ?

(Photo of generic rubber disc)
I use a 18g VST precision basket in my Sunbeam em6910 machine and neither the sunbeam grey disc nor the generic black rubber disc fit well (they are too small to create a good seal).
Can anyone recommend a suitable disc - I don't want to have to swap out the filter each time and would prefer a rubber insert.
Also can anyone advise if a full blind type is okay for an em6910 or does it need to have the hole just like the grey sunbeam disc?
(Photo of generic rubber disc)
I use a 18g VST precision basket in my Sunbeam em6910 machine and neither the sunbeam grey disc nor the generic black rubber disc fit well (they are too small to create a good seal).
Can anyone recommend a suitable disc - I don't want to have to swap out the filter each time and would prefer a rubber insert.
Also can anyone advise if a full blind type is okay for an em6910 or does it need to have the hole just like the grey sunbeam disc?

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