I noticed that one reviewer had pictures showing they had 6489 but there were no tabs at the top of the filter. I also noticed that although it shows 6489, the longer serial number on the right is different from mine. I'm including pictures of my additional serial number 6489 if it helps, but in my opinion, in addition to the 6489 model number, you should also have the locking tabs on the top of the filter. The black on the left is the new filter versus the old on the right.