A different OEM sourced elsewhere was the correct kit out of the box :/
The only other option is to look for the company who builds the OEM parts and find their suppliers. For example, you'll find Exedy builds clutches for companies like Honda. So if you can get an Exedy clutch from your local parts store, it's usually the same as the OEM part.
If you do research too, you'll find that there are a lot of high-quality aftermarket parts suppliers too. If you are looking for bearings, you can usually look for places that sell SKF bearings (or whatever you prefer), and measure and cross reference the sizes to find what fits your application.
So what it comes down to is, it depends on the part, and it depends on what is available from where. It's basically a giant research project for every part.
I think I'll take my chances with the "Mexican" parts you've described as I have seen them installed in countless cars and road deaths have only been dropping year over year.
There is no need for me to crucify myself financially because German plastic is supposedly better than Mexican.
For example, an after-market engine mount isn't going to kill you when it goes bad, but your wallet is going to be a lot emptier compared to just buying the factory part after you replace the damn thing every year. (I've had the experience, I tried a few aftermarket brands, I've since gone exclusively to factory and haven't replaced an engine mount in years)
I've been told this will self-regulate in a truly free market.
So is Walmart and Dollar General. It's always been the customer's responsibility to buy the product they want, not the store's. Don't want counterfeit crap? Don't buy IFONE FROM APPEL in the listings. I don't know when the last time I got counterfeit crap from amazon is because I look at what I buy before I buy it.
White labelling is just rebranding; I go to Home Depot and buy some screws, print out a label that says "jrockway's miracle fasteners", slap it on top of Home Depot's label, and sell them to you, that's white labeling.
Counterfeiting is when you inject seemingly-identical goods into the supply chain. You mix up some soap and blue dye in your bathtub, pour it into some recycled Tide bottles, and ship them off to Amazon's warehouse as "Tide brand laundry detergent". Now you are selling them to customers seeking a genuine product, but they're not getting the real thing.
White-labelling is a perfectly legitimate thing. Counterfeiting is a crime.
To be extra clear, your "I look at things on Amazon before I buy them" technique is exactly the sort of procedure that won't protect you from counterfeiting. The counterfeiters already fooled Amazon. Amazon thinks they're selling you genuine merchandise. But they're not. That's what upsets people.
I'm pretty sure Amazon doesn't believe this anymore either.
2. I doubt Amazon purposefully sells counterfeit goods.
I'm all for free markets but merchants have proven time and again, and long before China for that matter, that they can't be fucking trusted with anything. Sure, some are good, but the vast majority especially online will do any damn thing they can to increase bottom line.