Yes, it comes with the Tray, Backplate, Connectors and GA-56 Antennae.
When you convert to 430W WAAS it does not change it to a 14/28v. The internal power supply is not changed. The GPS receiver board and processor is changed along with some software.
The 28v units were available past 1st year of production. They will upgrade and continue to repair after upgraded to a waas unit. There is no difference between an upgraded unit and an original waas model other than the main component boards in an upgraded unit would be brand new!
1. What is missing?
2. Yes that is retail for the waas upgrade which includes the electronics upgrade to the unit, and a new WAAS compatible antennae. It also repairs some existing squawks if any, and updates some of the software.
3. Some units are 28v only and some are 14/28v. It is...