Same here, and I understand cars. This is repair fraud, actually, and a criminal offense in the US. If I paid for and was told I would receive an OEM part and

Same here, and I understand cars. This is repair fraud, actually, and a criminal offense in the US. If I paid for and was told I would receive an OEM part and instead I got some aftermarket part off RockAuto, I'd be beyond pissed off and I'd get my recompense somehow. I understand the grandparent point, but their analogy is terrible. When you are paying for a specific brand of item and you get an alternative brand without being informed and giving consent, that is fraud. It is a crime, and it is effectively stealing from you the difference in price/value/cost of the two items, since you're paying for the other brand.