I seem unable to find info on this issue. It will probably sound like a rather stupid question...

These spears are the ones used for phalanx units:

Spear, Short_Pike
Spear
Spear, Long_Pike

Thay can be easily changed from one to the other in the units files. They have standardized lenght, etc. But I was unable to find the 3d models for the 3. There is only a weapon_hoplite_pike_high.CAS and a weapon_hoplite_pike_low.CAS in the Rome - Total War\Data\models folder.

Where are the CAS files? If these spears have some parametric characteristic in-game is it possible to change the length of any of the following spears without 3d modelling? And if not how do we find the CAS files?

Thanks in advance for your answers...