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You can mount it provided you have a 3/8" bolt that will clear the slider's surfaces from under the sled. Like most tripod heads, the 504HD is flat and has the bowl mounted as an AKS.
[EDIT] I totally lied to you! Manfrotto called me back today on this question and they tell me that the 75mm bowl is made to both the 504HD and 509HD. The adapter to make it all flat is the 325N. [/EDIT]