The "unidentified" trim piece is found in the early AD trucks; one was located at the top and one at the bottom of the interior windshield center divide. The photos show the upper and lower trim pieces on my '48 Chevy 1/2 ton truck.
Attachments
IMG_3195.jpeg (267.02 KB, 138 downloads)
IMG_3194.jpeg (182.51 KB, 139 downloads)