Rear bearing seals???

I just tried to replace both wheel bearings and in the kit supplied were 2 seals. One with metal ring surround, the other a rubber push in seal. When taking off both wheel hubs i found one wheel had the metal surround seal and rubber seal and the other just had the rubber push in seal. Which is the right way and seal to use? Does this kit contain two seals for different vehicles and the idiot i bought the car from changed the bearing and fitted both seals by mistake. What does the correct seal or seals look like and how do they fit? Any help out there?