Update: A supplier in the UK managed to find one deep in their inventory. Phew.
From other posts on here it looks like the plunger has been redesigned to have two o rings rather than a single one like I have. I think I'll upgrade to the double to be safe!
Thanks for the replies. I'll make a note of those sites for the future.
I having bad thoughts about selling the GG and getting a KTM so the parts issue is not a constant headache!
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