I use them too, and they're great! They sent me the original moulds in case I needed another set. I read somewhere that when they take the moulds in the first place, it is better to wear your helmet then they mould correctly for the intended use. I don't know whether this is essential or not - I didn't do this, and mine work fine. Possibly worth a conversation with them, though.
I definitely wouldn't use disposable ones - these are great!
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