How to change attachment animations?

Hi dudes here's the thing yo: I'm using Spiked Barricades on a model I imported.
But the attachment (spikes) has more standing animations. To be exact. stand Large, stand Medium, stand...
It always uses stand Large when I give the ability to the model. But the model is quite tiny. How do I change this?

There is a field in the unit's entry in the object editor. Animation - Attachment animation suffix or something like that.