The only way to ensure authentic products is to buy direct. I buy most my parts from the manufacturer’s site. The more demand for a product the more likely it’s counterfeit. These counterfeit products will work and some people may never know, but it’s like paying for quality brand tools and getting harbor freight quality. Designer clothes, woman’s make-up and yes parts and tools are sold everywhere. A store wants to buy in bulk they look for the best deal, they do not know they are buying a large inventory of fake merchandise and sell it, even places like AutoZone (just example of a large auto store) can unwillingly sell counterfeits if they don’t buy exclusively direct. The way I see it, if a place sells below market price then they maybe unintentionally buying counterfeit inventory. These counterfeits are so good that they cannot be easily identified; it may have to be sent to the manufacturer for testing and verification. It is hard for Amazon to tell if someone using Amazon to sell merchandise is selling fakes, they have to be notified with proof and all they can do is report and ban the seller, the seller just changes the company name and returns. This will always be a problem until the original source is stopped. China is not our friend.