Radio: Grrrrr, again no luck at the salvage yard... Help

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Hi all! New here and very green to all this restoration stuff. All I want to do is find a good sounding AM/FM radio with cassette that will fit the dash cut outs in my 72 C/20

I've learned from the forum members here not to make alterations to the dash. I've been to several salvage yards that stock old trucks and every one that should have contained a Delco either didn't or had some aftermarket radio in place. Boy I'm frustrated.... grrrrr.

If anyone can redirect me I will be most appreciative.