Hi,
I put a Kenwood header unit in my 67. Someone had previously attempted to cut open the radio hole with, I can only imagine a spoon, so more time was spent cleaning that up than fitting the stereo.
In my new (er) 69 912 I'm fitting a Blaupunkt in car navigation unit, it's the same size as the standard unit. I'm then fitting the cd changer either under the dash or in the glove box.
Cheers
Alan
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