Donut washer identification

[armyash]

Does anyone know if these donuts are available on their own or what flush valve they come with?

Tried a few different to replace but no luck. Don't want to bodge it.

2"

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[ShaunCorbs]

Any good to you?

Conical Cone Shaped Donut Doughnut Washer for Toilet Cistern Seal Pan Rubber | eBay

 

[armyash]

Perfect, thanks!