This is available from Advanced auto Parts for $16. I just bought it last week b/c I purchased a stock concert sound radio that I wanted to install to restore the interior to the 1987 look.
There's a guy in California named Troy that adds an Ipod input to the front, and he can even add RCA jack preamps to the back. I had it done for mine to keep the 1987 look with some modern features and sound quality.
He's the person that runs the ebay auctions, that mentions his skill in placement of the drilling.
Just FYI - -they also sell the clip that converts that delco clip back to the wiring so you never have to cut out the original clip again should you ever want to switch back. It's $12.