Anyone know the bearing/seal part numbers for 68 Cuda 10" front drum hubs?

Rock auto is great on prices but some of their listings are wrong. Here's an example. For 1968 abodies they have mixed up the Timken seal part numbers for the 10 and 11 inch brakes.
The actual part number for the 10 inch is Timken 6840s
The actual part number for the 11 inch is Timken 8121s
Rock auto has them reversed.