Thanks for the correction, Gilly..

I might add that I had done a few NGK copper changes from the F8CD4 as a kinda experiment on two of my personal cars , and the findings were excellent for the first 5K miles , but after that they started to have problems at idle.. I went back to Bosch and no more trouble after several Ks.
I also tried NGKs partner NTK O2 sensors and did find them to be better than the Bosch. I did scope comparison charts and found them both faster and cleaner , and am awaiting longevity results...