Toto Ultimate flapper replacement

[Jackie Martin]

Thanks to this site I've successfully replaced our Drake flapper and now, as luck would have it, the Ultimate needs a new one as well but I can't figure out which one.
The stamp in the one-piece tank is CST 853 and the original flapper is blue.
I was about to order this one but it says it doesn't fit the MS853113 (I which I believe this is?) so now I don't know what to order.
https://www.korky.com/products/flapper-seal-replacements/fits-toto-power-gravity-3-flapper
Any help appreciated!

 

[Terry]

The Blue flapper for that model is correct, 1.6 gallons.
You can also pick up the universal 3" Korky flapper that adjusts for different amounts of water used.

 

[Sponsor]

 

[Jackie Martin]

Thanks! We got the fluidmaster adjustable for the drake...so now to decide which colour is better
I was confused since that online link says it's not compatible. Possibly a typo!

 

[Terry]

This was the original flapper
https://www.korky.com/products/flapper-seal-replacements/fits-toto-power-gravity-3-flapper

You may not be able to find one like that now though. And I've had problems with

I won't use this one on the Ultimate even though it's their replacement. The flapper doesn't drop down all the way on the one-piece flush valves.
https://www.korky.com/products/flapper-seal-replacements/genuine-toto-3-universal-flapper

I have used this one for that.
https://www.korky.com/products/flapper-seal-replacements/3-premium-universal-flapper