Getting a lot of bang for your buck there. I looked up SIG, and they are a Taiwanese manufacturer.
https://www.shouie.com/
I dont know much about ball joints and tie rods, but you will want to make sure the quality is 100%. I think most parts now are made in China, Taiwan, Mexico etc.. The Mopar rear main seal i bought was made in Mexico.
Have you priced up Spicer or Moog from Rockauto or Summit Racing?
https://www.summitracing.com/int/par...model/cherokee
Seems like Spicer is 3 times the price. They dont mention where they are manufactured either.
Let us all know how they work out.
Cheer,
Cheers,