I would suggest to slather the O rings with petroleum jelly to make them slip easily - the new O rings that come with the new updated bushing are quite thick.

I personally use lubegard assembly lube for this. But petroleum jelly (vaseline) works too.

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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)