The K10-00276-05 system from Garmin includes the following items:

PN 010-01214-41  GTX-335 with install kit, back plate, rack and config module.
PN 011-3080-00  GAE-12 Altitude Encoder
PN 013-00235-00  GA-35 Antenna
PN 010-12661-00  Product Registration Card with instructions (see important note below).

***IMPORTANT NOTE***

The Product Registration Card includes instructions in that the unit must be registered with Garmin to access the Part 23 or Part 27 STC RTU Letter. Instructions are on the registration card.  DO NOT DISCARD THE PRODUCT REGISTRATION CARD.