1968 Dart radio bracket question

I'll continue to let someone else provide more input for now, after work I need to pack & get truck ready, we are driving to Florida right after work tomorrow.

@1968 Dart 270 At the time I had a 1977 Granada. Decent working kid high school car, 2 door, Bucket seats, 4 speed, Probably good that it only had a straight 6, The Dukes were big at the time and a huge influence on my driving style, and we had a source for beer. Next cars- 73 Sebring 318, 76 Regal 350, 79 Sunbird V6 5spd, 73 Dart Sport \-6