puzzigully

Guys,

I have a 1987 Corvette (of course), with Graphite trim (option 121 and 122)

I am also missing the lens and bezel trim piece on the B pillar on the Left Hand side.
It's the square light cover with 3 slots in it, just behind the driver at about ear level.

My questions are:
Is that trim piece uniquely "graphite" colored and I need a replacement from a car with the same options?
Any pointers as to where to source this part?