Metra has a kit for swapping the crappy original stereos for a standard single-DIN setup. It's what I have in WCJr.
www.amazon.com/Harness-Adapter-Fits-1988-1996-Chevrolet-Complete/dp/B0085W3PE8
I have their double-DIN kit for Roscoe, but I'm still a ways away from getting it installed.
www.amazon.com/Harness-Adapter-Fits-1988-1996-Chevrolet-Complete/dp/B0085W3PE8
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I have their double-DIN kit for Roscoe, but I'm still a ways away from getting it installed.