Okay, I'm still new to mustangs, mine being a 88 LX 5 speed hatchback. How do the rear speakers mount? I got this car cheap and the speakers were just laid in the hole with no covers. I now have covers and the cover mounts are intact. I don't see where to mount the speakers. Are they supposed to be attached to the same point that the grilles are mounted? Are there adapters to mount speakers?