mine has corroded totally to powder over the quarterlight area and is perfect for the area against the moving part of the glass .I suspect water somehow penetrates the outer seal for the quarterlight or is channeled there by the design of the trim. Its got two rubber blades below the trim capping that look like they might be guilty of doing this. Wind pressure as the car moves would direct water towards this area. One rear trim strip would provide two shortened replacements if I could source one!!!
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