chroming process. To chrome the stockers you have to sand the faces smooth and there was no way to tell if too much material was removed etc. Also there was no way to know if the chromed wheels where new or if they where junk yard wheels that have been repaired/had issues etc and then got dipped.
Also Z32 wheels are side & size specific and I know that people have gotten back not the wheels then sent in when you get 4 lefts in 16x7.5 on a twin turbo for example.