Sten,
There's an even easier method of determining 'which' box you should have installed, as well as other installed equipment, and that is to contact either Reims/Cessna or Cessna in Wichita and secure a copy of the Original "Weight & Balance and Installed Equipment Data" list for your specific tail number (as it came from the factory). This data will list a "Control Number" that specifies every component installed.
If unable to contact Reims/Cessna, I would try the Cessna Technical Support Department in Wichita, Kansas at (316) 517-5800.
BTW, you'll find a whole slew of 400 avionics items in Trade-A-Plane. E-Bay is another source under "Avionics".
Good luck on your project!
SkyKing
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