Hi - first post here! I think my front left wheel bearing needs replacing - there is an audible humming noise from that area when driving over 40mph. I've looked on GSF car parts and found two types of bearing kit, one Ԛ£19.50 (part no: B40020A) the other Ԛ£39.75 (part no: B40020). Does anyone know the difference between these kits? Also is the hub nut included in these kits?