Many 12's will work at 11
The Toto Drake will work at 10-7/8"
TOTO also makes a 10" that will work at 9-1/4"
CST744EF.10 or CST744SF.10
Comfort height, elongated bowl with either the 1.28 gallon Watersense Eco Flush
or the 1.6 gallon G-Max flush.