Clutch Cable Pulling Through The Firewall

Anyone else have a similiar problem? We have a customer's 2003 Cobra with an after market clutch. Nothing is binding, but this is the secod STOCK cable to pull through the firewall. Anyone experience the same thing? What did you do to take care of it? Thank you for you time.

*edit- Want to clarify that the cable is not pulling all the way through. What is happening is the plastic part that is on the engine side of the firewall keeps breaking.
 
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