7083 is not even close to any F4U bureau number. 7083 puts you firmly in the Consolidated PB2Y-3 series.
That being said, the combination "7083 FT228A" refers to a standard mount fixture for the AN/ARC command radio set; specifically, for a four-transmitter remote contro. The AN/ARC-5 was the standard wartime USN/USMC aircraft radio. See: http://en.wikipedia.org/wiki/AN/ARC-5