CS:S props in HL2:EP2

[Sprocket The Dragon]

I think this question might have been asked before, but I can't seem to find anything on it. So, I am currently making a map for HL2:EP2, and have found some CS:S props that I would like to use in it. I extracted all 6 of the files for the model in GCFscape, however, I do not know the proper place to save the files. Would I extract them to an existing file, and if so, which one? Or do I need to create another file to save it in?

If it matters at all, the model I am after is: props/de_nuke/truck_nuke.mdl, as well as truck_nuke_glass.mdl