Quote:
Originally Posted by Ikwalsh6677
[...]came across these two grommets/ bushes, sat on the tray that protects the sump. [...] They are 22mm in diameter, tapering to 16mm and look to have a course thread on the inside, they have a depth of about 6mm.
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I believe they are cylinder head cover rubber seals p/n 11121437395.
They are supposed to be replaced each time the valve lash is checked.
In your particular case, when you changed the spark plugs you had to remove the engine plastic cover (p/n 11127835905).
I would say that when you unscrewed the fancy nickel plated nuts (p/n 11121401517) which hold the engine plastic cover, the foremost two nuts didn't come off their studs (p/n 11127838078), but instead the studs unscrewed from the cylinder head together with the nuts. Since the studs came off, the two rubber seals (p/n 11121437395) between the studs and the head cover fell off, and you found them in the sump tray.
It's just my scenario (ask me how I know...), but I may be wrong.