[Gorp]

I'm installing Alpine SPR-17c in the rear doors of my hatchback. I believe the 600's are the previous version.
The magnets are HUGE and barely clear the door limiter when closed, but they fit. In front, you'd have to play with backspacing, but I'm thinking you can get these to fit.

 

[Gorp]

I'm recycling a set of Infinity Kappa components up front and they're definately smaller than the Alpines.

I used two sets of speaker adapters from these guys:

http://www.car-speaker-adapters.com/items.php?id=SAK050

I needed to be careful how they were clocked since the door opening isn't concentric with the bolt pattern. Paying attention got me the results I needed, but the wire connections are still pretty close, but won't touch.

Up front, you'll need to be careful of the window clearance, but I belive you could get them to go.