How to set vector parameter on an actor from actors array?

Hello everyone!
In my project i have players based on one mesh with various attachment models of haircuts and facial hair (actor classes) with base color exposed attached to it to give a sense of variety. The set of these attachments has grown much so i wanted to make it more elegant and flexible - i put these attachments into an array. So far the attaching part works as intended, however now i cannot change the color of it. In other way, now i cannot pull a link from SpawnActor to Set Vector Parameter Value. It’s possible when I put a specific actor to SpawnActor function but not possible when actor is picked from the array. How can i get to this material on a mesh? Current logic attached.