if your disc is a solid piece of rubber - it can go in either way - the discs that should only go in one way are the soft cushion type discs - those have offset separate rubber bosses from the main disc to soften downshift.

Those have the writing - diese seite zur gelenkwe" on them.

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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)