Where to find column textures in game files?

Okay so what I am trying to do is recolor this wooden ceiling beam cc object I found with one of the base game pillar textures, so that they match when used together. I know you cant edit pillars in s4s so thats why I need to find the texture manually if that's possible. Or if someone else has extracted them already that would be useful too! Im new to making cc so I dont really eve know where to begin looking. Ive checked the game files but haven't found any textures so far.