I'd like more info too and maybe pictures! There are specs for these things even if Midwest control isn't giving them. Rod ends is a pretty big subject.
The ones you bought clearly are not suitable for your car's suspension. That doesn't completely mean they are bad, but probably bad for applications that actually require rotation etc.
So I'd like this discussion to continue, but let's try to get to the root of the matter so we can understand what to look for and buy for these cars. Things like lubrication method, grease, PTFE, Nylon matrix etc. Materials like stainless, heat treated steel, low carbon steel, aluminum. and on and on.
Even the good bearing houses sell various imports, some at low cost some not.
Another area that I found confusing is the actual strength ratings. They seem to fall in groupings but I haven't entirely figured the correlations yet. For instance one issue is that 5/8" rod ends are often only a small bit stronger (10%) than 1/2" ones, yet the 3/4" ones are hugely stronger (2x).
I just posted this picture so I'll show it again, here's a "high quality" rod end in a "used" tie rod. It appears to still be a serviceable part. The tie rod is a heavy wall tube that is directly threaded for the rod end. This is a three part unit with a PTFE lining and maybe it's stainless - no corrosion after sitting around for 20 years...