Unfortunately, squeezing speakers into a small compartment like that is about the worst thing you can do to them. The Tannoy Revolution XT Minis would fit in there, but I'm not sure what it would sound like. Tannoy makes a pretty nice sounding and looking speaker, the tweeter is set into the middle of the woofer for superior imaging.
You haven't mentioned what will be driving the speakers, which would help.
You haven't mentioned what will be driving the speakers, which would help.