All of the facia pieces came with that hole in them. If your car had electric mirrors, another piece was fastened over it with an adhesive. That section of the panel will pop out and can be replaced. Even if you could find a center piece that's been cut up for an aftermarket radio or is busted, it might still have that piece in it that's good. It could be that yours became separated somewhere in the last 20+ years. If you don't find one around Wichita, call Bobby Ward at North Yale Auto north of Tulsa; he has a few in his yard.
Ed
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Ed Raner
ROA #279
Heartland Regional Coordinator (Kansas City area)
1963 Riviera - Black w/ white leather
1964 Riviera mild custom
1985 Riviera - Dark Blue (stealth mode)
Some days you might have to be the statue, but other days you get to be the pigeon.