I will hopefully be able to put up some pictures this evening when I get home from work. as of right now you are missing:
the HU (obviously)
the metal sleeve that slips over the HU and has tabs to hold it in place (a universal part that you can get anywhere)
the harness from the HU (should be included with your new HU) to the large plug (which is a standard Protege plug and required a special Kenwood to Mazda unit to work directly)
so basically you could have everything you need when you get the new unit but otherwise you'll only need to pickup a standard aftermarket adapter plug and solder...
the unit goes pocket on bottom, then the bar sits on top of that and you can see when you hold it up how its supposed to go, then HU on top of that.
the HU (obviously)
the metal sleeve that slips over the HU and has tabs to hold it in place (a universal part that you can get anywhere)
the harness from the HU (should be included with your new HU) to the large plug (which is a standard Protege plug and required a special Kenwood to Mazda unit to work directly)
so basically you could have everything you need when you get the new unit but otherwise you'll only need to pickup a standard aftermarket adapter plug and solder...
the unit goes pocket on bottom, then the bar sits on top of that and you can see when you hold it up how its supposed to go, then HU on top of that.