Do you also know if any other cars/trucks have compatible windows?
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For having found the G-Class forum section for your W463 chassis car.
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Once you have the actual parts # for the window, LKQCorp is the largest wrecking card/car recycle Co in the world. Around here their 'Pick your Part' are self service. Otherwise, I believe the have parts inventory online. Check LKQCorp or or other self service wrecking yards in your area.