What you are experiencing is very common on the early cars. It has to do with the decklid bumper stops being the incorrect height such that the decklid vibrates against the rear bumper and causes the wear marks you are seeing. It becomes worse at speed with the read spoiler pushing down on the decklid.
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There is a TSB for this in the early years that replaced the bump-stops with taller ones to eliminate the issue. I did that and while it was slightly better, it really didn't eliminate the issue. (some of the early fixes were to simply spin the bump-stops 180° to get a greater height)
What I ultimately did was get 1" wide black-out vinyl tape and installed it on the top of the bumper across the width of where the deck lid sits. When it wears over time I replace it (every couple of years). There aren't any aftermarket bumper-sill plates available that I have seen that will resolve the issue.
There is a TSB for this in the early years that replaced the bump-stops with taller ones to eliminate the issue. I did that and while it was slightly better, it really didn't eliminate the issue. (some of the early fixes were to simply spin the bump-stops 180° to get a greater height)
What I ultimately did was get 1" wide black-out vinyl tape and installed it on the top of the bumper across the width of where the deck lid sits. When it wears over time I replace it (every couple of years). There aren't any aftermarket bumper-sill plates available that I have seen that will resolve the issue.
