A couple of questions.

[HK1837]

I'd say the radio isn't an original for this dash unless there is some adjustment available.

The bottom bit is closed in, that has been cut out probably for a CB or graphic equaliser.

[79Z33L]

Thanks, HK. The radio is indeed not the origional. It came out of a smashed up 1977 HZ Kingswood SL sedan that was in the same wrecking yard I bought this ute from. As for the hole in the dash, that's what I had thought, however nothing was there or in the radio space when I bought it.