When I buy them I just get what ever looks OEM for the particular car I'm buying for.
So when choosing an overlay, it would either say Pontiac or Chevrolet or??? I generally don't pick the custom overlays that say something other than what OEM would.
It's all personal preference, but the biggest reason I do these radios is OEM fitment and appearance. Otherwise I'd shop at Best Buy or Radio Shack.
Do what you like, You'll enjoy it.
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2019 Pontiac Heaven class winner
https://youtu.be/XqEydRRRwqE