So, hunting around the wrecker checking on projects, I came across one of these-  A Daihatsu Move. The reason it doesn't have a disc or hub on that side is because I have them on the bonnet of a nearby car..   They are unusual because the disc mounts on the back of the hub, like a RWD, while nearly all FWD put it on the front of the hub so the wheel bolts it into place. You can see the diameter is bigger by 16mm, or 8mm of radius.  The swept area is MUCH bigger, 30m