Call the manufacturer. You can usually google up a phone number. I
just went through the same thing with a newer toilet where a trip to
Home Depot came up with clerk selling me the wrong flapper.
Manufacturer gave me part number and told me Lowes, but not HD, sells
them, which they had in stock when I went there. Manufacturer also gave
me two suppliers phone numbers where I could have ordered by mail if needed.
Take old flapper to a plumbing supply house or hardware store and find its
If a replacement cannot be found, consider replacing the entire assembly
with a new one. They are cheap and the repair should take less than a few
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