the E300D has replaceable joints, the only cars that did not have replaceable joints were the E320, E420, E500 and the 300E that used the M104 engine.

If you peek into the front wheel holes and see fixed calipers you need the whole arm, if you see floating type then the joint is a serviceable item.

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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)