You didn't share which box your using but both share most of the following details
For a little more detail for restoring the box since the black (if you choose to add that detail) will not cover everything
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You have a cast iron main body with fresh machined surfaces at the logical and proper places.
Zinc plated - end cap/plug,
Darkened steel - adjustment cover retaining bolts
Fresh bare steel - adjustment cover, adjustment nut, ID tag and vent cover and large collar nut. NOTE: Vent may have been zinc can't tell at the moment
Shaft for the pittman arm is fresh machined steel.
Digit cameras and lighting can affect how the following pictures look (contrast between finishes) on screen