I ended up calling American Standard to verify the part number. The woman I spoke to was very helpful. I ordered this part for my Crane PF/2 (car flush toilet 2 installed in 2000) which leaked every time the toilet was flushed. The old seal had deteriorated and water was leaking out. This new gasket was almost the same shape as the old one, except that it was slightly thicker and made of foam rubber rather than hard rubber. I installed it yesterday and I have my toilet again! I definitely thought I had to replace the old toilet, but thanks to this gasket I'm fine.
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