Shop UI with Runtime Scroll Lists issue

I’m trying the tutorial for generating a shop. Shop UI with Runtime Scroll Lists.

At one point in the 5th video @ 3:25 it says to drop the prefab into ButtonObjectPool/SimpleObjectPool/Prefab slot.

I don’t have that slot available. I copied the scripts from the archive page and everything looks the same up to that point.

Any ideas or suggestions?

fixed