Or if you don't feel inclined to mess around with spring compressors, most small shops can compress and install the springs for a small fee if you remove the assembly from the car and take it to them. I found this easier to do and saved myself a bunch of hustles.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.