the gap is behind the old spoiler, i don't think a new trunk lid is needed, i think just a spoiler cover and maybe some harware, but on that part i do not know yes, as i have not changed out the spoiler.
As I stand a 99 with the new rear bumper and 99 spoiler everything works fine there is just a indention in the bumper for the new spoiler, the trunk lid fits fine.
Gary
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