No idle fuel o ring?

[Suzanne]

Hello, so I'm learning about the GS500, and had issues with vibration, se previous post here https://gstwins.com/gsboard/index.php/topic,74409.0.html

As it turns out, it was a fuel issue, when I rebuilt the carbs, I had no spare parts, but looking at the exploded view I think I am missing the idle fuel screw washer and Oring. I suspect this because to set proper idle mix, I have to set the screws in weird asymmetrical positions, and when doing the standard 3 turns out my left plug got badly fouled.

Am I straight up missing these parts, is it even possible? Or are they just old and stuck?  I have an image I took with a mirror: https://share.icloud.com/photos/038TuThy7KWsuB16wABGO6tgg

[DarkCyDE]

Yes it does have an o-ring. No, you dont appear to have one. I believe most rebuid kits have them though. You may luck out at the stealership.
Hope you get it straight.
Mike