Quote Originally Posted by Rsmith350 View Post
The MAXIMUM height of ANY point on the spoiler/wing from ANY point on the DECK LID/rear hatch may not be greater than 12.0 inches.

The end plates are part of the spoiler and not considered a separate piece. The measurement is from the deck lid and does not include any present spoiler. This rule was based off the Cobra R wing if I'm not mistaken. Don't know if that helps at all.
The fact that #1 and #3 explicitly define the end plates leads me to believe that #2 does not include the end plates.