Well, I'm not sure why they told you that! The case is not where the connectors are. Here's the needed part [product|IF123-071-2] now the grounding clips are springs which sit in slots as you can see here
[image|2707090]
You'll need to pull the logic board out to gain access to the screws which hold the Port assembly and/or access the springs. Now if they have snapped then you will need a new case assembly unless you can find a junker to steal them from it. Here's the guide [guide|131550]