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If I understand your image correctly, you have two side panels that match the shape of the template, but the central section actually extends from center of the rear glass and acts as a raised Bonneville style flat spoiler ?
If that's the case, then why not just have it extend from the roofline ? It could be mounted on a hinged edge so it could swing upwards with the trunk. It would them match the template curve without the additional drag of a flat spoiler design.
Of course it would have to be transparent.
I probably am not understanding you image . If that's the case, nevermind.
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