None of these kits for 2018 twin cooled CVO Ultras. The OP specifically asked about CVO Ultras. As far as I know there is no Stage 2, Stage 3 or stage 4 kit specifically for the 2018 CVO Limited. If anyone knows differently please show us!
The stage 3 kit I posted fits the CVO Ultra, it is on mine. Stage 3 is what the OP asked about.
If you go to the online store and enter the model as 2018 FLHTKSE, then search for Screamin Eagle Performance, it will show you items that fit this bike. The stage 4 kit 92500064 lists the 18 CVO Limited as proper fitment as well as the stage 2 power cam. There are also tunes available for these in the street tuner.