A picture is worth a thousand words. Or two questions.

But in case you're blind:
1) Fronts are 6 1/2, rears are 4.0, or 5 1/4 (with sometimes necessary spacers).
2) No rca jacks
Ia Performance (among other places I'm sure) sell spacers for the rears.
http://www.iaperformance.com/index.p...th=44_45_54_56