The way to do it is to make a plate that includes mounting holes that mate up to existing bolt holes on the spindle. If I build some for the stang I'll copy something like this:
http://store.kennybrown.com/files/im...e%20Duct_0.JPG
It mounts onto the spindle using the dust shield attachment points. Seals off the inside of the rotor and insures the air passes through the rotor vanes as it should.
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