Ah right, I needed to work back from TriggerBox2 towards Set Collision Enabled.
If anyone else is reading this thread, make The TriggerBox2 reference first(blue node), then drag off that to create the Collision Component Node, then drag off that to get the Set Collision Enabled Node. Doing this the other way or trying to get Set Collision Enabled by dragging on OnActorBeingOverlap and you won’t be able to find the nodes you’re looking for.