A weapon for Birdiepult

[Rykon-V73]

I know there was another model that will fit the mechanized artillery, but I can't seem to find it. It's in Warcraft 3: Reign of Chaos. I thought of using the guard tower arrow as a weapon. Is there another projectile that might fit the Birdiepult?
Edit: Link to model: Birdiepult

 

[ILH]

You meant "Abilities\Weapons\BallistaMissile\BallistaMissile.mdx"?

 

[Rykon-V73]

Thanks! That worked, ILH!