Re: Building a Custom GMC Dash Bezel from the ground up :).
The metal rim/baseplate was stock on the 1960-61 at least. I'm not sure when they switched to plastic. I just trimmed the center out of mine, added slip-on sheet metal nuts around the edges, and screwed the face plate to it. I would imagine the same approach would work with the plastic item as well, if there is enough thickness to hold sheet metal screws around the edges.
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