Derek,
If you can wait until I get home, (oh, 4 hours or so), I can verify how it assembles. I believe, from wheel out to the right side, it goes disc, gearbox retainer (the wings go against the wheel), the silver circular metal piece (cover) that holds it to the wheel (the grooves face inside, lock the retainer down, this has hole for the rotor bolts), the paper washer, then the speedo. See the attached pic: