Also curious, is there any particular reason to be so impolite? Or is that just natural.

What do you mean by this? was just trying to give you some information. When it comes down to it it is your vehicle and you can do whatever you feel comfortable with. I am just speaking from experience with purchasing Chinese parts for both my cars and Motorcycles. I have seen good parts and I have seen parts with flaws that fit like crap, or brake and come apart.