I removed the Garmin 430W but left the tray in. All you would have to do is buy a 430 with an 8130 form and make a log book entry. No radio shop needed.
Out of annual. Annual was due the end of last month.
Asking $28,000 as-is. This is a steal.
or rather than a 430, an Avidyne IFD440!
http://www.avidyne.com/products/ifd/index.htmlplug & play.

gorgeous plane, next owner is a lucky person.