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I believe this has the integrated spoiler, but this is the only one I was able to find using a quick Google search... interesting that the trunk lid is not so common...
I contacted the owner of Unlimited Products (up22.com) and asked if they made fiberglass trunk lids for 69 coupes. He said no, but then told me if I sent him an original metal one he would use it to make the mold for a fiberglass one. He said he would then send me back the metal one, the fiberglass one, and all this free of charge! That was at least one year ago, probably longer, and I was too busy at the time to take him up on his offer. Maybe if you ask they will offer you the same? Just a thought.