Here are the six pieces used in C6 mechs (in case you hadn't already figured it out).
More importantly, however, is the XML needed to create a Wanted List on BrickLink. The list is for 20 of each of the pieces in new condition in Light Bluish Gray (Also called Medium Stone Grey by Lego). Once you import the list you can adjust the colors and quantities, etc. to your liking.
Here is the XML in a text doc. Just open the file, copy all the text and paste it into the Upload section of the "Add Item" tab, in your Wanted List on BrickLink.
If anyone needs more detailed instructions, let me know and I'll post them (I know it's not a very intuitive system).