After a recall by Rover of MPi Minis, these taper roller bearings were retrofitted to late Minis, which were often equipped with 13" wheels. They have added an o-ring to help seal out water. Set includes seal and o-ring. The o-ring is installed first on the stub axle, before the first bearing.
The kits supplied by Seven are genuine Timken taper rollers, not to be confused with aftermarket bearings supplied in some kits.