There are numerous words I hate in the tuning "scene". Stance being one of the worst. Closely followed by Spacers. However the real winner is the misuse of the word Fitment. There is even a company called Fitment Industries that has created their own meaning of the word Fitment.
Just for clarity let's make the issue simple.
And this is something entirely different. Many search engines seems fixated with this new definition. Don't use this word, your price could rise quickly.
Acceptable words are: Offset, ET, Width, Tyres, Rolling Radius, Arch Gap, Scrub Radius - BUT NOT FITMENT