Get a license plate or side marker lamp holder from any GM in the junk yard, solder in the pigtail, and forget it. They have the bayonet tabs for retaining the socket into the acrylic light bar.
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Ok I went to O'Reillys and they had the Dorman 85814 GM side marker sockets. 3.99 each. Wasn't in the help section like other stores are. Found these in the bulb section.
That one may require a little trimming on a couple of the latches, but an X-Acto should work nicely. Those that I recall had a fairly soft (vinyl?) body and could be cut and formed pretty easily.