[sourdough]

When I replaced the Thetford an "adapter kit" was also recommended but found that the items included with the toilet took care of the issue. The main thing was the rubber gasket that fits the bottom of the toilet - the different toilets had differently shaped gaskets so you might verify what comes with the particular toilet you're looking at. The inlet to the sewer pipe should be the same no matter, the bottom of the toilet and how it mates to the sewer pipe will be the issue. The flange may require a bit of reorientation but I'm thinking (hope) you don't have to replace a lot of extra "stuff" to get the toilet replaced.