Parts for a 1978 Allegro Motorhome

Help, don't know if I am doing this right, but here goes.  I need a Wheel Hub Seal and Shaft Gasket for a 1978 Allegro Motorhome.  I can't find these parts, they all say the home it too old.  I am not ready to drive it to the Junk Yard yet.  Please let me know if anyone knows where I could get these parts.  Thank you all so much.