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I hacked out my original because the PO had already hacked it years ago to put in a cassette player.
Here is an adaptor plate.
http://www.ebay.com/itm/Chevy-Corvette-Radio-DASH-KIT-Single-Din-Install-Aftermarket-Stereo-Faceplate-/380450306056?pt=Motors_Car_Truck_Parts_Accessories&hash=item58949af808&vxp=mtr
I bought one of the "high dollar" single din bezels ,thinking I was getting something special, ie. a newly tooled casting to accept a DIN radio.
It was nothing more than what rydoc said he did, above. It was a typical repro bezel cut to accept the plastic adapter for a single DIN radio. (although the plastic adapter came with it and was attached)
Same here, only it looked like Ray Charles cut it out with a chainsaw. I returned it, got a used one and cut it out myself.