Speedo Cable Leak on NP-205

[Quickie]

I have read a few threads on correcting oil leaking at the speedo cable hookup at the NP-205 . My cable goes into a gear reduction housing that connects to the NP-205 speedo housing. In previous threads I've read the fix as replacing the speedo sleeve in the transfer case(part # is now discontinued), others I've read to replace the seal. Where does the seal go on the sleeve or the reduction housing part? Do you suggest I replace the reduction housing? And where to get one?