It's all about cost. There's usually a version with metal cups foe an extra couple of quid. In the aftermarket, you'd be an idiot to try to save a couple of quid, but to OEM buyers every cent matters.
@gbj_tester started
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It's all about cost. There's usually a version with metal cups foe an extra couple of quid. In the aftermarket, you'd be an idiot to try to save a couple of quid, but to OEM buyers every cent matters.