Ye, they do have one but I can't imagine why. It really doesn't do anything. The seal is what keeps the grease in the bearing and the contaminants out of it.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
On the 69-70 disc brake set-ups there is a gasket between the backing plate and the spindle. I looked all over for them, then found Corvettes use the same gasket, so sourced a pair from the local Corvette place. I can get you the part # later tonight.
-- Edited by seventy2plus2 on Tuesday 15th of May 2018 07:44:45 PM