anyone know this seal?

[SquareSweeney]

Hey trying to do a front end rebuild on the 76 k10
pulled driver side and passenger side axles and found this seal only on passenger side,
local part guys stumped and so am I.
Name or part # of seal would be greatly appreciated.

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[idahovette]

That's the spindle bearing seal. Napa lists a kit ,bearing and 2 seals, Part # PGB PBK1 or BK1

 

[highdesertrange]

yeppers, supposed to be one on both sides. highdesertranger