7.5 ford rear end.

need help identifing year of 7.5 rear end. Casting #s C20W- 4668-E. Has 10" brake drums, brake cyl's use 27/32 cups, having problem
finding correct axle seals. Wheel bearing ID 1.375" OD 2.835" . Does rear end require 2 of the same seals? HELP!!!!!!
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