Uhh, am I the only one wondering what would leak out of a manual steering box?
The EPC shows a seal for the pittman arm - three "optional with" numbers: 001 997 93 46, 002 997 71 46, and 002 997 72 46.
There is also a seal on the shaft connecting to the coupler: same deal: 002 997 47 46, 002 997 70 46, 004 997 15 46.
Something should be available from a dealer or the Classic Center.