63 Valiant: does anyone know of an aftermarket radio that will fit the dash of my car? The knob holes are 6" on center.
Thank you

There are several aftermarket radios for old cars that have adjustable knob spacing. Look at Classic Industries radio selection for a sample of what is available.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

You may have to cut the large opening slightly, you see many had this done in the 60s and 70s to get common radios at the time to fit.

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63 Plymouth Valiant Wagon

See here.

Buying anything from Classic Industries is an efficient way of blowing good money on bad garbage.

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