I Just upgraded my panel to a new King KT-74 transponder for ADS-B out.  The KT76C worked perfectly in my panel.  Here are some details:

Bendix/King KT-76C Transponder (Unit with Tray)

P/N: 066-01156-0101; 

Serial Number 2158 (3.1 lbs)

Features:

• Digital Mode A/C, panel-mounted transponder with sequential pushbutton code entry
• Pre-set VFR code
• Operates with both 14 and 28 volt electrical systems
• Slide-in replacement for existing KT-76A
• Backlighting of bezel nomenclature and knobs
• 200 watts peak minimum transmitter power from PA Tube
• Operates up to 35,000 feet
• TSO'd

Shipping will be UPS only and  Shipping cost to Lower 48 states included in price.

Will ship within 48h.

Shipping only to the Continental United States including Hawaii and Alaska.