Kohler K-99003-TLC Guía De Instalación Y Cuidado página 17

13. Install the Shelves
Determine the shelf locations and insert the slotted pins into the holes in the sides of the cabinet.
Install the shelves between the slots of the pins.
Install the caps to the unused electrical holes near the top of the cabinet (except K-99011-TL).
Kohler Co. 17 1267931-2-H