There is a plastic spine type piece in the rear door rubber seal on the left door of my W124 - but its missing on the right door, the rubber seal is also cut and I beleive its the cause of road noise too.

Anyone have the part no. for the item? or the item itself

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Could you upload a photo of the existing left door part?

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2004 E500 4Matic 138,000 miles