legit??? OEM???

hey i am in need of a new exhaust o-ring something terrible, is this the one i want?
i am running full fmf, and the flange to motor is leaking, this is wht takes care of this problem correct?

im asking because this is the same guy that sold me leaky base gaskets.

Vito's Yamaha Blaster YFS 200 Exhaust to Cylinder Gasket 1988 2006 | eBay

i would buy the copper one. i bought one of these and i got it stuck in the exhaust when fitted it and it ruined the one in link. but bought the copper ring and it can get squashed by exhaust if it isn't all the way in and its still fine.
 
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ok thanks, yes i do have one in there, but its toast mostly just the metal part of it left in there with alittle of the now black white stuff