This is pretty cool...and it's the only one I've ever seen in my 40+yrs of working on these cars.  
 
This is a "radio delete bezel" and according to what my research shows, it fits P body cars (CSX, CSX-T, etc..).   However, upon looking at it, I can see it appears to be the same bolt pattern as pretty much all FWD Chrysler cars from the 80's and 90's.    But before you purchase, please do your own research, as all sales are final.  
 
Mopar part number:  4372399      

Comes with the original Mopar bag with OE part number on it and comes with the original sticker that says it was sold to Shelby Automobiles March 16th, 1990.  This was right around the time they closed their doors.    Very rare/cool little piece of Shelby/Dodge history for your collection!!
 
If one was so inclined, I suppose you could use it to mount/hold gauges, but it would be a shame to cut this one up to do that...but to each their own.
 
My idea for this?   Put a bad ass Shelby decal on it and install it in the place of the radio.  I think that would look awesome!