You can use any seat that matches the "Crane White" but it's not a perfect match.
Bemis/Church now has a color match to Toto which is a -200 eg: 1200TT-200 they charge more than regular white though and they make a soft-close.
The only problem is that Toto does not make their own seats. They are made by Centoco/Bemis/Olsonite etc... so check it out before you bring it home.
I haven't had negatives for bowl wash on Dalton, just fill valve problems.
They use the cheap Coast ballcock that has the rod and float.