There are actually two related questions I got:

So I recently replaced the cracked dash piece by the windshield with the piece off my old truck... While there, I noticed there were two wires ran right by the windshield to both sides and seemed like comin out the middle - one black, one grey. I honesty did not pay that much attention to it. Well, now I noticed my upper dash speakers do not work (I haven't had the truck for that long and normally don't listen to music) and I can swear there are two tweeters on each side. However, this is an SLT sport truck and I thought these trucks didn't have the infinity system? There ain't a speaker in the middle and they don't like like after market units but what do I know.
So are SLT's supposed to have them?
Could these wires be for the speakers? Or are they supposed to be covered from factory?
The thing is, I don't want to pop that plastic piece of crap off again since it cracks without knowing what's supposed to be there.