Yes. Trent’s. He says it is a single lip seal, and here are the pictures with part numbers shown (and dimensions for the one in question...
This is the seal you DON’T want:
And here are the seals that ended up working for him... first the steering column side:
Then the seal kit for the pitman arm side:
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2