Early A dash question...

I've been working at this for a while but haven't gotten much in the results department. I have a 66 Valiant but the radio hole was cut out for a DIN unit as shown.

View attachment 1715599514

I want to restore this to a shaft radio. The problem is, I have no idea what the original uncut dash should look like. Here is one that should be pretty close, it's a 65 Dart dash available locally on CL. Is this an original version, with that trapezoidal hole? And is this what a 66 looks like? If so I will grab this for some surgical repair. It is affordably priced so this would be cool if it fits the bill.

View attachment 1715599512

Second question, what did the original radio look like? I have seen many shaft radios but I can't figure out which one is the right one.

Many thanks to all who have chimed in so far trying to solve this mystery.
May be @66340SEDAN wil chime in. He has a pair of 66 Valiants.