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)