idler arm bushings genuine or lemforder

Seems thr crunching sound on my sec when turning the steering may be due to the idler arm bushes failing and not the lower ball joint. Any ideas why is would fail after 350 miles, is it now best to go for a genuine mercedes item or a lemforder item

Seems thr crunching sound on my sec when turning the steering may be due to the idler arm bushes failing and not the lower ball joint.
Any ideas why is would fail after 350 miles,
is it now best to go for a genuine mercedes item or a lemforder item

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