If you are looking to purchase an Adjustable Base for a King size mattress, please add two King Half bases.
If you are looking for a CA King size mattress, please add two Half CAK bases.
If you want a setup where you can move both sides individually from each other, you can order two Twin XL Helix Mattresses to use with two King Half bases.
For both size King and CA King, your Adjustable Base will ship in two different packages.