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That black side of your piece should face the trunk. I have seen where the screws get installed from the interior side of the board also. I'd re-use the original piece if it can be touched up and look ok.
+1 +1. The waxed looking side is water resistant as has been speculated. Also I have seen the board installed directly over the trunk mat and others where the trunk mat has been trimmed back just to the edge of the divider. Just from my own observations I have seen close to equal amounts installed ether way on NJ cars . I don't have a wide experience with other plants. Bob