It's possible that the picture you are looking at is representative. Lots of times companies that sell similar parts will take a picture of one part and use it for many... like if they sell 5 different kinds of impellers for mags, they'll use a picture of one for a Mag 18 for all of them, etc. I know the Mag9.5 has 6 blades.
You may be able to call your vendor ask them to actually go look at one and tell you.