The ebay ones have nowhere to mount to the trunk and these have the correct mounting indentations to bolt right on. Look at the eBay one and it's completely smooth.
There are two versions on eBay. There's a Canadian seller that has a version like the original DC with the indentations for the push rivets.
That version is slightly narrower though, leaves a little more of the trunk exposed on each side. It's less than a 1/4" but it's noticeable if you compare it side by side to an original DC spoiler.
This version looks a little closer. Do you have any pictures of the inside? How thick is the fiberglass?
