You found a pretty good resource there. Bottom line for sure is you need to get the set...escutcheon, extender,sleeve, handle...that are specified to go together. I can't tell you for sure that every set fits every rough in. Definitely there is only ONE stem, just different extenders
You might also find that not all those parts are available. Most of that is NOT available from Delta anymore, but the aftermarket companies still make some of it.