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I've never seen zerks on those things. They are just caps to cover the nut and the bearing. I don't think the grease could even get to the bearing from the cap.
Must have been an "upgrade" by the previous owner.
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68C10
1968 C10 SWB No Options but 40K original miles
1967 K20 LWB 283 4-speed
South Plainfield, NJ
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