I'm about to sell my wife's Jeep Grand Cherokee and before I do I'm going to pull out the speakers and drop them into the Crossfire as well as the DVD Video Head Unit (Panasonic CQ-VD7001U).

Here is what I have in the Jeep:

6X9 JBL GT Series
6 3/4 JBL GT Series

I'll leave the stock tweaters, unless someone thinks they should go too.

My question is, will the 6X9 replace the rear subs which Crutchfield says are 6 3/4 as well?

Also what install kit do I need to order from Crutchfield to hook the head unit into the factory amp and avoid rewiring the car?

Thanks in advance.

EA