JL Audio rear 3.5 speakers C2-350x New.
 

These are brand new, I haven't even taken them out of the plastic bags yet. These will fit in the rear of the Z with no problems. Asking $65 shipped. I'm simply going with something different.

Evolution® C2 3.50 in. / 90 mm Coaxials
Woofers: Injection-molded, Mica-filled,Polypropylene Cone, Polyether Foam Surround 0.75 in. Voice Coil on Kapton® Former, Symmetrical Roll Spider, Ferrite Magnet
Tweeters: 0.75 in. (19 mm) Silk Dome, Ferrofluid Cooling / Damping Neodymium Magnet
Crossover Networks: N/A
Continuous Power Handling: 25 Watts
Rec. Power Range (per channel): 10 - 40 Watts
System Efficiency: 83.0 dB @ 1W/1m
System Nominal Impedance: 4 ohms
System Frequency Response: 130 Hz - 22 KHz (± 3 dB)

http://i6.photobucket.com/albums/y20...m/CIMG2355.jpg
http://i6.photobucket.com/albums/y20...m/CIMG2354.jpg
http://i6.photobucket.com/albums/y20...m/CIMG2356.jpg

Hmm. Ponder, ponder.
Just being nosey, but what are you going to put in?

Sold...