Matching Luger question - Don't Shoot!

All this part replacing makes we wince when I read the classifieds where people are scouring the woods for a particular numbered part. And often the parts they are looking for are major ones, certain to interfere with proper functioning. IMO such ads should not be accepted in the Luger forum classifieds. There may be no fraud intended, but inevitably some buyer down the line will get hurt.