I'm going to be purchasing a complete replacement set of speakers for my father's 1999 Suburban for Christmas. But I have a small problem. I don't live near him, and I don't know exactly how many speakers and what size is needed. I don't really want to call and ask him as it would make it pretty obvious what's going under the Christmas tree. Anyways, from what I gather, there are 6 speakers? 2 in front doors, 2 in rear doors, and 2 in the ceiling above the back doors? Front's are 6-1/2". Rear's are 6-3/4" Ceiling's are 4x10" Is this correct? Are there any other speakers that need to be purchase other than those 6? Also, Crutchfield has a note saying the front speakers don't match any regular aftermarket speaker sizes. What is this all about, are adapters needed? Any help or experiences would be appreciated.