All shelving bays shown on the website come without an end run.
An end run is the upright and base leg needed to stablilise the unit.
Only one end run is required for every run of shelving you order. For example, if you order 20 bays that are part of one complete run only one end run is required.
Likewise if you order 1 standalone bay you will also need to order 1 end run.
In short, the quantity of end runs required is dependent on the number of shelving runs as opposed to the number of bays.