I found some on Ebay I believe, and they were called red berries, or something similar. I think the company was called Florida Auto Fasteners, or something. Very cheap and you get plenty to do several sections. My problem is the hole in the body has deteriorated and is bigger than the insert now in some places.

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85 300CD Turbo "Das Polluter" 230K sold for $3,000

98 BMW 323is