OS standard plugs fit all standard engines but for some reason they are shorter then everyone elses so while they will work in other engines you will have slightly less compression.
Their turbos work in most engines. While they technically fit in Nova based motors the taper is different and they can leak.
My point was that the way he worded his question made it sound like everyone else should be using the OS standard but it seems to me if everyone else uses one length while OS uses another then it's OS that has gone against the standard.