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I think my modern record headset has them both but I got it a while ago so can't confirm. I'm sure it's just to keep dirt and a bit of water out but if you maintain it regularly it should be ok.
Edit: If you have to pay postage for the 1 anyways, if you can stretch to it, you may aswell get the top one too. Edit 2 (if it is a chorus HS)
3c70
At 4 quid its worth a pop... cheers. Weird thing is the diagram states the same seal is in the top set but there's nothing there either and that's all fine.