Pilot-USA, Adapter for G/A Headset to Comtronics .25" Single Plug Interphone, p/n PA-91
Pilot-USA, Conversion Kit for David Clark H10-76 Military to G/A usage, w/ PA-5X Mic, p/n PA-176
Pilot-USA, Adapter for G/A Headset to Icom A3, A6, A14 & A24 Transceivers, p/n PA-82
World Pilot Supplies, Single .25" to Dual G/A Connector Adapter, p/n WPS-2