Lower ball joint question.

I have a 1976 Dodge dart sport slant six car factory disc brakes I am redoing the entire front suspension. The lower ball joints were purchased as a unit. Upon inspection I notice the surfaces where they bolt to the spindle is not machined flat on the mating surface. Anyone know or get these and use them? they from a Chinese kit sold on amazon. I think the brand is dze they bolt up fine look straight but not good surface contact. Should I run em? Or buy something else? I noticed this is not the only brand like this.IMG_20180920_124010.jpg IMG_20180920_124023.jpg