I'm not sure it would fit. I took my Royal apart a few months ago because I curious about how it compared to a Kirby in its engineering. I think Justin is correct about the armatures. I'm thinking the diameter on a Royal armature is a little smaller. Plus, the blades on a Royal fan are deeper. So I don't know if there would be enough clearance inside the fan case. But I'm not positive about these things, because I wasn't thinking about interchanging fans. So I wasn't looking for those things. These are just vague recollections.