I have a 2020 Flying Cloud 27FB and when I look in the Parts book pdf it has the same Airstream number you listed for my toilet. There is also mention the same unit is used on 25', 25FB, 27FB, 28' and 30' models. I took a picture of the label on mine when I replaced a seal, it reads "MFG#302310091 310-SS/RP/WHITE. It is a ceramic model with elongated bowel. Originally came with a plastic lid and seat that felt like sitting on tupperware which I replaced. Hope this info helps.
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