This item is out of the box
Size King / California King Heardboard and footboard. This can be used for either size, just need to add whichever size bolt on rails you need.
Dimension 74.5"
For more information https://www.wayfair.com/furniture/pdp/three-posts-adcock-solid-wood-low-profile-sleigh-bed-w004051414.html?piid=830195951