The first part is something you need to ask the seller about. As for the quality check the seller's feedback (which will also tell you where they are registered, and in the case of Asian registered sellers where the item is likely to come from.
If it's a high-volume seller and they have less than 99.5% feedback be very wary about buying from them. In reality you'd be better off getting the controls from an authorised Harley dealer - sure you'll pay a bit extra but you'll know the quality is good.
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