These arms are suspicious. I wouldn't install them on my car for 2 reasons.
1.Mild high carbon 1018 steel, very brittle, suspension with no flex likes to break.
2. MIG welds not conducive to long life and strength at the stress point-NO PENETRATION.
Remember what I say when the arm falls apart on a road course and tears up everything attached to it.
I bought a mazda and all I got was some crappy motor mounts and wheelspin.