These are the plastic versions of the vinyl covered rear seat arm rests used in some 1968-72 Cutlass, 442, etc... I'm not sure of exact application. They were/are white-ish in color.
I have 2 of one side & 1 of the other. Other than a couple tiny cracks & a little fading, all are in good condition. Like to get $25.00 each plus shipping.
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Scott
c. 317-727-7041