The Buckingham toddler bed conversion consists of a new bed end that replaces on end of your Buckingham cot.
Simply remove the cot sides, and replace one end with your new bed end to create a transition bed that is still familiar for your toddler, but is helping them get used to a 'big bed'.
For your peace of mind you can couple it with a Genesis
Bed Barrier which is made specifically for use with a toddler bed at this stage of your toddler's development.