Those large mounting trays are what I remember in the M38A1s back in the late 70s when I joined.
Those washers are, I believe, called a thackery washer. Seems to me there are some located on the top and bottom trays of the radio set on those brackets that lock the transmitter and power supply unit into place.
I have some of the original mounting brackets out in the shed waiting for a suitable project. I also have a couple of C42 sets waiting for the same.
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