Willy,
The rear wheel seals are available from Mac's. The Ford part no. and Mac's part no. is BB-1175-C (4.56 inches outside diameter)
Read their on-line catalog - they have engine parts & some electrical parts that will fit a carrier.
http://macsautoparts.com/ford-pickup...0R3CHL1108200/
THE SEALS THAT CROSS REFERENCE IN THE CR-SKF BOOK & OTHERS
WILL NOT WORK!
The carrier brake drums have a flange for the sprocket that trucks do not have. I think these also vary from Canadian to UK or Au built carriers.
Jack