Originally Posted By: robricc
...I wouldn't be surprised if there was an actual Honda part for fitting a DIN stereo in the Fit/Jazz. It may not be easy to find in the US though...

My trusty online Honda Parts Source doesn't seem to list any such item for the dashboard, but I only did a cursory check of a couple sections (accessories-interior, audio unit, console, instrument panel).
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10101311 (20GB- backup empeg)
10101466 (2x60GB, Eutronix/GreenLights Blue) (Stolen!)