Sruffman,
I was wrong about the separate purchase of the SE billet plates; at least they have part number in the instruction sheets instead of "not purchased separately". The billet plate in 25284-11 is PN 2540018 and the plate in 25282-11 is PN 25400019. The pump is the same PN for both plates PN 62400001. So, you, depending on cam choice, you can run either billet plate and the hi-flow pump. Just check availability and price on one of the online discount HD sites like Newcastle, Surdyke, etc.