10" rough-in question

Greetings,

Just picked up an old house (built in 1979) with roughly 10" rough-ins.

I am having trouble understanding the Toto unifit adaptor. I figured it was an adjustable adaptor that allows you to slide it in or out to adjust the distance your toilet sits from the hole so you can fit a toilet built for a 12" rough-in where you only have space for a 10".

Then I read the description on some of the toilets. For instance, I decided to go with the MS874114SG. Every description I find says it comes with a 12" unifit adaptor.... BUT, 10" or 14" adaptors are available. To me, this indicates that I need to buy a 10" adaptor along with the toilet - not that the included 12" adaptor can be adjusted. I don't know what the answer is. "Unifit" seems to indicate that one adaptor fits all rough-ins. But it sounds like you maybe need to actually buy different adaptors for different roughins.

I really dont know what I need to do.

I am getting so confused looking at this stuff that I cant decide whether the 12" roughin toilet would even fit my 10" roughin with the unifit adaptor.

Can anyone explain this to me and tell me what I need to buy to put the MS874114SG in my 10" roughin bathroom?

You need to throw away the 12" adapter that comes with it and buy a 10" one. Kind of a pain that you can't exchange it, but that's the way it is.

Thanks for the quick and costly answer. They sure charge a lot for those things. Stupid that you can't just choose which one you want.

Anyway!

Any advice on my selection? I have it narrowed to three options (ordered by cost, low to high):

2x Gerber Ultraflush 21-317 with 2x Toto Elongated softclose seats (ADA, elongated, 10" roughin, UltraFlush)

2x Toto MS874114SG with 2x 10" unifit adaptors (CEFIONTECT, elongated, 1 piece, g-max)

2x Toto MS974224CEFG with 2x 10" unifit adaptors (CEFIONTECT, elongated, 1 piece, dual cyclone)
https://terrylove.com/pdf/ms974224cefg.pdf

I am already way above what I wanted to spend on these things, but assuming I'm going to choose from these three, what are some experienced thoughts on the various differences/options?

I'd probably go with the Eco Guinevere.
The double cyclone flush is supposed to do a great job of bowl wash.