It could well be.So when I removed the discs of these mowers I could clearly see that was this creamy colour.These is also a very good possibility that their will be no known prove of which was right or wrong (so to speak),a bit like the Model 6 model 9 id issue.As their could well be no documentation to say what was what.That's why I painted them that colour as I could clearly see that colour under the boss part.