This one's not as easy as it looked at first.
The top picture 164605 appears to be looking up along the right side of the radio. The larger silver shell is a light socket for an indicator light or dash backlighting. Looks to have a broken-off brass bulb base still inside. The radio uses one of these for the pilot light, but it's way up inside the radio. Maybe it is the light socket for the clock?
The black plastic piece looks like it is broken. Can you tell where the wire comes from? Or is it a stub wrapped around the light socket wire?
The radio antenna lead plugs in the right side face of the radio high up and to the rear. Is the antenna plugged in?
The bottom picture 164642 appears to be taken looking up along the left side of the radio. The stripped-back wire coming off the headlight switch is in the foreground. The power feed enters the radio at the upper left corner of the back face. A black plastic fitting is barely visible on the back of the radio in the picture. It is just near the ventilator cable crossing through the picture.
The broken black plastic piece in the top picture may plug into the hole at the top left of the back face. What I don't know is if the fuse plugs in up at the back top left entry or if it had a more standard inline fuseholder with 2 #14 wires attached.
Attached are are a couple of pictures of the radio from some aftermarket service data. The antenna socket is visible at the top rear corner of the right side in the front view. The back view with the cover off shows the power lead entry connector along the arrow pointing to C11. The parts list shows a replacement fuse holder to be a Bussman HRJ catalog number which is still available. List shows the original Buick fuseholder part number as 1321178. There is one of those for sale now on eBay. The picture looks like a unique Buick part that isn't present in the pictures under your dash.
The fuse and tubes are supposed to be replaceable without pulling the radio from the dash. It might have to come out to figure out what is missing or broken off in that power entry fitting. Maybe you can tell more with another inspection.
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