The bushings are already pressed into the arms. They probably failed. For most shops, the least expensive way to replace the bushing is to replace the arm. The cost of the labor to replace the bushing exceeds the cost of the entire arm.
There are also bolts that should be replaced (torque to yield) that appear to be included in the kit.
After the arms are replaced, it would be a good idea to get an alignment. The shop that replaces the arms should be able to do this or sub it out.
Good luck.
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2017 430i w/ Strut Brace / M-Perf brakes / M-Sport anti-sway / 255/40/18 square / iDrive-6
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