The Stovebolt Site Forums The Shop Area Driveline Replacing seals on my Torque tube.

I think you are looking for an Oakie bushing. They are right at the transmission end of the torque tube. They come in two diameters. Getting the old bushings out and the seals can be a challenge.
https://www.chevsofthe40s.com/detail/6271/Chevrolet_Driveshaft_Oakie_Bushing_With_Seal.html