Stock radio. How much does it cover the dash knob holes?

[Mister-B]

I removed the non working cheesy aftermarket radio from my truck. I was a little ticked to see that they slightly ground the inside edges of both knob holes to get it to fit. They didn't do much. Maybe less than a quarter inch. It still has a piece in tactic each side between the main stereo opening.

I'm looking at buying a stock AM GM radio, but I'm wondering how far the knobs overlap the holes, in hopes that it might cover up the part they cut? If not, has anybody found a good gasket, washer, etc. that would look good?
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