Try Specialist Air Service.
They have an EASA CVR/FDR Kit based on L-3 system.
http://www.specialist-aviation.co.uk...elicopters.htm
we've been getting spares from Bell and other suppliers (Aviation Instrum
If by "Aviation Instruments" you mean "AIS" in Miami, FL, then keep talking to them
They will help you out at the end of the day...
Top guys, helped me out on many an occasion when in the lurch.