Jordan, are you wanting to exactly replicate the stock spoiler's shape? If I understand correctly you will be splicing this piece into the trunk lid skin, and the ends into the quarters. I think if it did not have the 3/16" flat across the top, that would look cool and help it look not fiberglass. I don't know if it would make shaping the piece any easier but it would eliminate the complication of that flat if there is to be no seam on top.
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Matt
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