Might still not fit. The spec sheet http://totousa.com/admin/upload/pdfs...t774s-1001.pdf shows 3/4" behind the toilet. I didn't check all of the Totos that use the Unifit adapter, but all that I did check show 3/4" clearance behind. The way to measure is from the center of the drain in the flange to the wall (don't include the baseboard). There's usually a little fudge factor, so depending on the exact measurement, it might fit.