I'm trying to install a big brake package on my kid's Daytona ES. I'm getting two different options for the rear inner bearings, a SET46 or a SET39. Is it just a situation where I have to match up the numbers on the existing bearings to determine which I need?

Also, has anyone run into a situation where the hub may have been machined for a larger bearing race? On one of my rear hubs, the race literally just drops into the hub, with maybe 1/32" of play. Race number is LM12711, which matches what came out of both hubs, plus two other outer races I had on the wall and both of the new outer bearings. All are loose in one hub, but seem correct for the other hub (I haven't pressed them in yet).