1.25 inches rubber washer (Saint Philip's S1)

Does anyone has a rubber washer like the one in the photo?

I need it for my bathroom sink bottle trap. I need the rubber washer to have an inside diameter of 1.25 inches (the diameter is around 1.5 inches if you consider als othe outside rubber).

As you can see in the photos, the rubber washer I have seems slightly bigger. Not sure how it used to fit inside before I opened the sink's bottle trap.

I opened my bathroom sink's bottle trap and the rubber washer was partially off... I am unable to put it back inside.

Alternatively, does anyone know how to fit it inside the bottle trap? The existing one might be still fine tho.
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