Distributor cap seal?

Hi people.

Silly question, I know, but I've just picked up a genuine Nissan dizzy cap for a 2000 K11. I plan to change it within the next week as part of my service. When I looked at my current one it suddenly occured to me I'd need a seal, won't I? Last time I changed one was on a MK3 Escort, and I can't remember if it had a seal or not.

Thing is, a quick Google and ebay search doesn't seem to suggest such a thing exists for a Micra, and my new Nissan cap came without one. Does it need one?
 
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