My 2 cents...it seems Carrozzeria has changed their design over the years. I bought these from GPW back in the fall of '09. On mine the flange that the sprocket carrier fits into is part of the hub itself-all one piece. It appears yours is two piece. The sprocket carrier just slips into the cush drive sleeves and rubbers-no bolts except for the special sprocket bolts that fit into the steel sleeves of the cush drive. By the way, this cush drive is known to be a wear item on these wheels and I just replaced mine($71) after about 10,000 miles and there was enough slop that the carrier bearing took a beating and was rough enough to require replacement($85 ceramic bearing

). Here's a shot of the old cush drive parts and one I just took of the wheel-excuse the dirt but I finally got her out yesterday for the first time since fall and didn't get home till well after dark.